Windows error 0x80131904, -2146232060

There is already an object named in the database

Update-Database failed from Package Manager Console. I've used Entity Framework 6.x and code-first approach. Error is "There is already an object named 'AboutUs' in the database." How can I solve this problem? internal sealed class Configuration : DbMigrationsConfiguration<Jahan.Blog.Web.Mvc.Models.JahanBlogDbContext> { public Configuration() { AutomaticMigrationsEnabled = true; AutomaticMigrationDataLossAllowed = false; } protected [...] read more

How to add LocalDB to Visual Studio 2015 Community's SQL Server Object Explorer?

PROBLEM I don't understand how to make LocalDB show up in the SQL Server Object Explorer. On some VMs, it shows up automatically, on some other VMs, it doesn't. Still, after googling for hours, I don't get it. CURRENT SITUATION 1. I have a clean VM 2. I installed Visual [...] read more

System.Data.SqlClient.SqlException: Invalid object name 'dbo.Projects'

My MVC app is returning SqlExceptions when trying to access any table in my database. Exception Details: System.Data.SqlClient.SqlException: Invalid object name 'dbo.Projects'. My app us linq for the data layer. If I use an old dll it works fine, (so doesn't seem to be a problem with the DB) just [...] read more

Entity Framework 5 Multiple identity columns specified for table. Only one identity column per table is allowed

I am creating this model as part of my code first entity framework public class NewUserRegistration { [Key] public int NewUserRegistrationId { get; set; } } Using the Update-Database -Verbose -Force command in the Package Manger ConsoleI get this exception during the this bit of the update Applying automatic migration: [...] read more

Specify Azure SQL server edition in EF Core without breaking local development

Entity Framework Core introduced the methods HasServiceTier and HasPerformanceLevel to change the edition of an Azure SQL server. You can use them in OnModelCreating like this: protected override void OnModelCreating(ModelBuilder modelBuilder) { base.OnModelCreating(modelBuilder); modelBuilder.HasServiceTier("Basic"); modelBuilder.HasPerformanceLevel("Basic"); } If you use Add-Migration Add-Migration you get a migration like this: public partial class [...] read more

.NET Core can´t connect to SQL DB

I build a new .net Core Web API with connection to SQL DB. I have problems to connect the API with my Database I tried a local DB "DefaultConnection": "Server=(localdb)\\MSSQLLocalDB; Initial Catalog=ib; Integrated Security=SSPI", and a remote (see appsettings.json). Remote: Microsoft SQL Server Express (64-bit) 11.0.2100.60 System: Microsoft Windows NT [...] read more

Azure: Login failed for user

What I have done: * I added Resource group in Azure. * Added Web Service with previous resource group. * Added SQL Server Database with previous resource group. * Retrieved generated connection string from this database and provided here username and password. * Added this connection string to App Settings [...] read more

Error connecting to MS SQL from one server but not the other

We got a MS SQL server and two web site servers. I'm in the process of moving all the sites from one of the web site servers to the new one. My asp.net sites are not able to connect to the external ms sql server after I've moved them to [...] read more

SQL Server 2008 R2 Express + Wildcard SSL Certificate

Wildcard certificates (for example, *.example.com) simply did not work in SQL Server 2008 or lower. But Encrypting Connections to SQL Server on MSDN states, plain as day, that > SQL Server 2008 R2 supports wildcards certificates. Excellent. So I set up SQL Server 2008 R2 Express on a machine, and [...] read more

Azure Web App Error, No such host is known

When Running the web App locally there is no issue to connect to the DB, after deploying the Web App to Azure the DB(Also Azure) connection attempt throws the following error: [Win32Exception (0x80004005): No such host is known] [SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection [...] read more

Random connection failures between IIS8 and MSSQL 2012 in RackSpace Cloud

Background For years I hosted all of my server functionality, including IIS, Apache, MySql, and MSSQL on a single server instance, yikes! As my client base grew this led to persistent SQL Timeouts when the server got busy. Over the past year I've reorganized this into three servers, one Windows [...] read more

SQL Server 2012 Connection Timeout Expired

I am running MS-SQL Server on Windows Server 2012. From time to time I get this Exception: > Server Exception : System.Data.SqlClient.SqlException (0x80131904): Connection Timeout Expired. The timeout period elapsed during the post-login phase. The connection could have timed out while waiting for server to complete the login process and [...] read more

Can't connect to my own MDF file. Cannot open user default database. Login failed.Login failed for user... and other errors

SQLSEXPRESS service IS running!! I have I program I wrote some time ago and it works. It was written in MS Visual Studio with local MDF file. How is it possible to edit this file from Microsoft SQL Server Management Studio? I don't see this file in the list of [...] read more

A connection was successfully established with the server, but then an error occurred - provider: TCP Provider, error: 0

My web site was working flawless in the old Host, But now i Moved to a new host Please pay attention: The Old host was a VPS on the same host So i'v stoped paying him and now i'm hosting on the same host as a shared host. So I [...] read more

How do I disable TLS 1.0 without breaking my IIS/ASP.NET websites?

We are running Windows Server 2008 R2. TLS 1.0 has been non-PCI compliant for some time now, and disabling it via the windows registry is easy. In the past, though, disabling TLS 1.0 has caused 2 problems for us: 1. It's impossible to connect to the server via Remote Desktop. [...] read more

Cannot connect to sql server by IP Address but using the hostname works

After upgrading to the newest version of windows (windows 10 build 10586) I am no longer able to connect to a remote sql server by ip address. Here is the error I see: > [SqlException (0x80131904): Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake [...] read more

EF Core There is already an object named 'AspNetRoles' in the database

I am receiving There is already an object named AspNetRoles in the database. error while attempting to use update-database command in NuGet console. Context: public class ApplicationDbContext : IdentityDbContext<IdentityUser> { public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options) : base(options) { } public DbSet<Customer> Customers { get; set; } } Startup: public class Startup { [...] read more

How to fix System.Data.SqlClient.SqlException: Login failed for user

When I run it I get this: Error Screenshot I enabled Windows authentication in IIS, SQL Server, and also added the authentication method in web.config: <system.web> <authentication mode="Windows"/> </system.web> (I am literally out of ideas...) As you may see, the DataConnection is running: DataConnection Screenshot The connection string from web.config: [...] read more

How do I use Entity Framework Extensions BulkInsert and AllowDuplicateKeys

I am importing data from a CSV file into a SQL Server DB, the CSV may contain duplicate entries. My existing code uses SqlBulkCopy() and "IGNORE_DUP_KEY = ON", all is well with duplicates. I am switching to code first using EF Core with Zzz Projects Entity Framework Extensions. Primary keys [...] read more

The MARS TDS header contained errors - ASP.NET Core + EF Core 2.1.4 + Azure SQL Server

I have an ASP.NET Core app [Microsoft.AspNetCore.App 2.1.4] with EF Core 2.1.4 [DbContext pooling enabled] and data stored on an Azure SQL database. Occasinaly [once in 1-2 days] I get unrecoverable error stating System.Data.SqlClient.SqlException (0x80131904): The incoming tabular data stream (TDS) protocol stream is incorrect. The MARS TDS header contained [...] read more

EF Migrations - There is already an object named '' in the database

I am having trouble adding a new table to my database. these are the commands I entered when trying to add the new migration: Add-Migration AdminSett > Scaffolding migration 'AdminSett'. The Designer Code for this migration file includes a snapshot of your current Code First model. This snapshot is used [...] read more

Entity Framework migration error

I added a new table to my existing SQL Server database. I am using its generated id as the key. I ran dotnet ef migration add NewTable, which ran without errors. I reviewed the migration file and this is what was added for my new table: migrationBuilder.CreateTable( name: "InboxNotifications", columns: [...] read more

How to reference host port from docker container in MSSQL Server connection string?

Orchestration: * Windows Host * My DB is running in a container on localhost:1444. * My API is running in a container on localhost:5000/5001. * They are both running on the default (bridge) network. * I can't use a custom network because currently our app references another API that is [...] read more

How to debug composite entity with "Incorrect syntax near the keyword 'FROM'" exception?

I created a new composite entity based on two new entities. Those in turn are based on new views, which are based on new queries. The queries are based on a mix of standard tables and views and custom tables. Similar composite entities were created in the past and work. [...] read more

AZURE_KEY_VAULT provider in SSRS

I've recently set up Always Encryption on an on-prem SQL Server db with the column master key in Azure Key Vault. If I SELECT from the table in SSMS with 'Column Encryption Setting=Enabled' I can read the column in plain text so _I'm pretty confident* the encryption is functioning as [...] read more

Dynamics CRM 2011 Import Organization from different locale fails on SQLException

I'm struggling with a Dynamics CRM 2011 , when trying to import an existing organization - coming from a customer's Window Domain, not ours. THE SETUP Two servers. * One windows server 2008 r2 x64 Standard (locale fr-FR) for the Front-end, WebApp and all * One Windows server 2008 r2 [...] read more

How to find missing permission in MS SQL server

Problem description:I am trying to use SQLDependency on a table of a commercial product (TAC Reservation Assistant). The DB is a large Microsoft SQL 2016 database on which we don't have db_owner rights (only TAC does). I am now trying - together with support staff of TAC - to grant [...] read more

Exception when upgrading organization from crm 4 to 2011- invalid column names

In development and QA environments we've upgraded dozens of organizations from dynamics v.4 to v. 2011 without a hitch. Naturally, when we try to upgrade our first prod organization, we run into a previously unseen error during the import process. It seems like the new schema for the 'Organization' table [...] read more

Team Foundation Server (TFS) 2017 Failing to create backup

So we've had backups running for a few years now, and in the last few days it started backing up extra times. I went to reconfigure the backups to verify the settings and got an error saying it can't backup the dummy database. [Info @12:03:50.669] +-+-+-+-+-| Running Confirming Permissions: Confirming [...] read more

Azure VPN cannot connect to sql server

We have setup our VPN connection in Azure to our on-premises database, the connect is working with no problems. I have written a MVC app that tries to connect to our on-premise database in SQL Server and am getting the following error: System.Data.SqlClient.SqlException (0x80131904): A network-related or instance-specific error occurred [...] read more

Install SQL Server 2017 on Windows 10 Azure VM

I have one Azure Windows 10 VM set up as a workstation which has among other things: * Visual Studio 2017 * Python 2.7 * NodeJS * SQL Server 2017 When a coworker created a new Windows 10 VM and went to install SQL Server, he got an error. I [...] read more

Windows 2012 R2 Azure VM Cannot Connect To Local SQL Server

I created an Azure virtual machine running Windows Server 2012 R2 that I am using as a web server to host a couple different web sites. This is my first time ever doing something like this and I am struggling to get it to work. I installed IIS 8.5 and [...] read more

SQL Connection Problems between two servers

I have two Windows Server 2012 R2 servers HOST1 and HOST2. HOST1 has a web application that talks to a SQL Server 2014 instance on HOST2. When pulling larger amounts of data, notably during scheduled integrations, HOST1 encounters errors that cause processes to fail. There problem is always one of [...] read more

C#/SQL Server: Login failed when connecting from remote machine

I've got an SQL Server 2008 Express set up on one machine and am trying to connect with my C# app to the server from another machine (both Win 7). The server machine has a user account for me in the system. The SQL Server is configured to use Windows [...] read more

what instance name in connection string for Dynamic management Views

I want to run the following query :: SELECT S.* FROM sys.dm_exec_requests S JOIN sys.dm_exec_sessions R ON r.session_id = s.blocking_session_id It works when i run it in SQL Server Console. But I haven't been able to do the same thru code. I am using the following connection string: "Data Source=localhost\\sqlexpress;Initial [...] read more

Powershell Remoting always logs in as anonymous

I need some help in automating deploying some applications on my domain. The deployment process follows this basic flow in a Powers Shell script: 1. Stop services 2. Copy out applications 3. Log into at least 1 remote server and run "\Services\Shipping\ShippingService.exe /deploy" 4. Start services. I'd like to cut [...] read more

Timeout connecting SQL Server during the post-login phase

I'm getting this error: Microsoft.Data.SqlClient.SqlException (0x80131904): Connection Timeout Expired. The timeout period elapsed during the post-login phase. The connection could have timed out while waiting for server to complete the login process and respond; Or it could have timed out while attempting to create multiple active connections. The duration spent [...] read more

Fixed Cannot open database requested by the login. The login failed

I try to execute this web application but it gave me this error messages when I try to register a user account in the web application: > System.Data.SqlClient.SqlException occurred HResult=0x80131904 Message=Cannot open database "rentalsystem" requested by the login. The login failed. Login failed for user 'MicrosoftAccount\corene100@outlook.com'. Source=.Net SqlClient Data Provider [...] read more

.NET Core on Azure can't connect to SQL Server Database

I have a .NET Core API backend which is published on Azure. I also have a SQL Server database running on Azure, if I run my backend app locally it succesfully connects to the online database, reading/writing etc works fine. When running the online backend however, every API call results [...] read more

When Building my exe it cant find my database

When I build my project on the computer with Visual basic my exe file works but as soon as I open the exe on my server I get an error that I think it doesn't my database. Doesn't this get compiled at the same time as my whole program? I [...] read more

Identity Server 4 loggs (Invalid object name 'DeviceCodes') exception

We are using Identity Server 4 for authentication. After upgrading our solution from .Net Core 2.0 to .Net Core 3.1, we started to notice a new exception be logged when a client redirects to our authentication URL, which did not effect the process and everything seems OK for the end [...] read more

How to wait for MSSQL in Docker Compose?

I have a service (an ASP.NET Core Web application) that depends on MSSQL. The services are orchestrated using Docker compose, and I want docker compose to first start the database and wait for it to be ready before running my service. For that, I am defining the docker-compose.yml as: version: [...] read more

Blazor - The INSERT statement conflicted with the FOREIGN KEY constraint

I'm getting the conflicted error message on my foreign key table, however, the drop-down menu populates the course category ID, an INT field as a number but the column is bound on InputText, as a string instead of InputNumber, although io tried using the InputNumber data type on the razor [...] read more

Entity Framework get SUM from child property

I have the following model where I'd like to get the sum of all OrderTotalItems for all Orders of a Customer where the OrderTotalType (Enumeration) is "total" or 99: public class Customer { ... public ICollection<Order> Orders { get; set; } = new Collection<Order>(); } public class Order { ... [...] read more

Error in Exporting Created Models to Database in EDM

I already had a Users table on the database with the following columns and data types * Id - Int * username - varchar(MAX) * password - varchar(MAX) * RefreshToken - varchar(MAX) Then I added several columns to it as shown below. public class User { public User() { this.FollwedBies [...] read more

Execute Reader wait operation time out error

stuck on this since few days please help. I have tried a lot of solutions like increase connection timeout in web config: below is my error code. Server Error in '/' Application. The wait operation timed out Description: An unhandled exception occurred during the execution of the current web request. [...] read more

DbUpdateException error trying to use EF core code first

I have a simple Web API and I am trying to use entity framework core code first, with an external sql server database hosted on AWS RDS. My aim is for EF to create my model database/tables automatically, based on my context and models, the first time I use Swagger [...] read more

dotnet core 3.1 web api development sql connection fail on server

fail: Microsoft.EntityFrameworkCore.Database.Connection[20004] An error occurred using the connection to database 'databaseName' on server 'domainName'. fail: Microsoft.EntityFrameworkCore.Query[10100] I have developed a web api with dotnet core 3.1 on macbook. I used Scaffold-DbContext "Connection String" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models to connect to the existing database on a server. On local everything works fine [...] read more

ASP.NET [Win32Exception (0x80004005): Access is denied] Error

When I test it in Visuall Studio by pressing F5 and it's working fine and I can able to login the webpage and sql query process working nicely. Also note that my SQL server is active over internet which can be accessed using IP address. But when I publish my [...] read more

Creating SQL Server in Amazon, cannot connect to it using Azure Data Studio

I've created a SQL Server in AWS, here is the screenshot. enter image description here [https://i.stack.imgur.com/3wJm3.png] Then, I've pasted the endpoint, and try to connect using Azure Data Studio. enter image description here [https://i.stack.imgur.com/3dMXq.png] However; I couldn't connect to SQL Server I created through AWS. Here is the error message: [...] read more

SQL Server connection Error Number:2,State:0,Class:20

When trying to connect to a local SQL server (MAMP) I'm getting this exception: > Exception thrown: 'System.Data.SqlClient.SqlException' in System.Data.dll System.Data.SqlClient.SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is [...] read more

Create a subquery to filter on windowed function value

I'm trying to add ROW_NUMBER functionality to EF Core and filter by it. After adding custom function, it works fine in Select but doesn't work in Where, because of malformed SQL. Linq: var query = dbContext.OrderItems .Select(i => new { i.Name, RowNumber = EF.Functions.RowNumber(i.ProductId) }) .Where(i => i.RowNumber == 1); [...] read more

Why Can C# EXE Access SQL Server Datasource But DLL Is Blocked?

TL;DR WinForms in a C# DLL using DataBinding to a data source appear to be blocked from accessing the SQL Server database, yet raw SQL queries work. What am I doing wrong? -------------------------------------------------------------------------------- Detailed Problem Description We have a C# WinForms .Net Framework 4 application consisting of: - An EXE [...] read more

How skip some migrations in ef core?

I had some changes in my ef context and I added new Migraions dotnet ef migrations add changed98112601 then I run the below command dotnet ef database update I have the following output. It seems that want to apply Initial migrations. The Poems table is in database because it was [...] read more

Azure Studio connection Error with MS SQL on Linux Mint 19.2

I have MS SQL 2017 running on Linux Mint 19.2. I used "sqlcmd" to verify that it's running, and the reported version is "Microsoft SQL Server 2017 (RTM-CU16) (KB4508218) - 14.0.3223.3 (X64)" However, when I tried connecting to the database server using Azure Studio version 1.10.0 (For Linux) it failed [...] read more

Failure obtaining db row lock: Execution Timeout Expired What this error describes

Quartz.Impl.AdoJobStore.LockException: Failure obtaining db row lock: Execution Timeout Expired. The timeout period elapsed prior to completion of the operation or the server is not responding. The statement has been terminated. ---> System.Data.SqlClient.SqlException: Execution Timeout Expired. The timeout period elapsed prior to completion of the operation or the server is not [...] read more

We've been using DCN as our best networking app and it crashed can it be fixed?

Server Error in '/' Application. Login failed for user 'DB_A3CF5B_dynamiccircle_admin'. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: Login failed for user 'DB_A3CF5B_dynamiccircle_admin'. Source [...] read more

Sql Exception 0x80131904 cannot log in

My program connects to a MSSql database. If it connects via LAN it works fine, if it connects from outside I get the error message 0x80131904 Error when logging in the user 'ProgProj'. (translation might not be the same as on the english version. On the german version its like [...] read more

SQL Login fails for app but not for SSMS

I wrote a simple test application in C# (4.5) which does nothing more than connect to a database and display a message. (Basically just to test the deployment and DB connection.) On my local workstation everything works fine. I installed SQL Express 2012, connect as the current user (integrated security), [...] read more

Active Directory SQL Server Random Handshake Timeouts

We've installed active directory on a new server and joined our database server and web servers to this new domain. However, randomly, we'll get the following error. What would be the cause of the handshake timeout error we're sometimes seeing? The fact that it's not ALWAYS happening to me means [...] read more

Network Exception thrown after session timeout

My site will run fine and I can go through the entire site, but after my session times out, when I make another request to a page I get this exception: Server Error in '/' Application. The system cannot find the file specified Description: An un-handled exception occurred during the [...] read more

Unable to connect to a new installation of sql server

I just installed SQL Server on my Windows Server 2012 R2 box. The installation went well but my apps can't connect to it. If I use the public DNS name for the server in the connection string, the stack trace looks like this: > [Win32Exception (0x80004005): Access is denied] [SqlException [...] read more

Getting Error while calling a UDF function with function name having special character ampersand in NAGIOS

While calling a UDF function in NAGIOS with function name containing ampersand '&', It returns an error > System.Data.SqlClient.SqlException (0x80131904): The multi-part identifier "dbo.udf_tarrif_t&TT" could not be bound read more

How to get my VM on Azure to allow in My SQL Connection?

I have a Virtual Machine that is running my web api. I have then created a SQL Database through Azure(this db is not on the VM) and I put that connection string in my application. I get this when I try to run it. What do I need to do [...] read more

Intermittent DB connection failure

Recently I started to see intermittent errors in log files of my web application. Raising from different places of the application the error is always about failed connection to DB which is located on another server: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The [...] read more

Delete TFS Project Collection - SqlException

I'm trying to delete a team project collection in TFS 2010. Unfortunately after struggling with some old instances (some that don't even have databases anymore) I get an error even when attempting to delete a brand new instance. I go through the detatch process and get an error during the [...] read more

How can I troubleshoot an application connecting to SQL Server

I'm trying to get ASP.net StoreFront to Connect to SQL Server Express 2005, on Windows Server 2008. I followed This Microsoft Support article without success. Below is the error. [SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or [...] read more

Hosting Website Issue

I have a web project which I want to post in to our company`s hosting server: IIS Vs.6.0. The name of the server which is running our whole websites is: testing.test.com and domain is testing.com I am added as a User in it as myname@testing.com. Now in the IIS Manager [...] read more

Error 0x80131904 when adding items to a Sharepoint Online list

I created two custom webparts using react and the pnpjs library: * A Forms Webpart that allows me to consult, add or edit items in lists of my sharepoint site. * A Migration Webpart that allows to migrate list items from my previous sharepoint site to my new one. It [...] read more

context.Database.Migrate(): No connection could be made because the target machine actively refused it?

I cloned https://github.com/dotnet-architecture/eShopOnContainers and try to run some tests. The following method called by the test case raise the exceptions private static void InvokeSeeder<TContext>(Action<TContext, IServiceProvider> seeder, TContext context, IServiceProvider services) where TContext : DbContext { context.Database.Migrate(); // Error seeder(context, services); } Microsoft.Data.SqlClient.SqlException HResult=0x80131904 Message=A network-related or instance-specific error occurred while [...] read more

Login failed for user 'DOMAIN\ServerName$' after database connection error

Our website is released to live and running normally for days or even weeks. And then without any change it suddenly starts to throw database connection errors: Error System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.Data.SqlClient.SqlException (0x80131904): Login failed for user 'DOMAIN\ServerName$'. at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean [...] read more

Job execution error after upgrading from SQL Server 2016 to SQL Server 2019

We have our database in SQL Server 2016 and we restored the same database, packages and jobs in new SQL Server 2019 server instance. We changed the environment variables to point to new server and also pointed new package path in the jobs. While running the job we are getting [...] read more

Why EF Core is generating the wrong name of the navigation field when creating SELECT clause causing exception?

I have a asp.net core 2.2. project with EF Core. I'm facing this issue. Look at the table below that has two foreign keys: enter image description here [https://i.stack.imgur.com/HKyB0.png] When I run scaffolding, the above table called RubrosContablesCtasBanc, EF created the class and Fluent DbContext as it follows: public partial [...] read more

VB.Net Forms Authentication - Roles.CreateRole()

So I recently started moving my applications over to a more secure authentication system for my un-managed users. I saw Forms authentication for VB.Net and had no issues getting started. I got two new users created and logged in with working password resets. I just tried to use the Roles.CreateRole [...] read more

C# System.Data.SqlClient.SqlException Cannot insert the value NULL into column ERROR FOREIGN KEY

Error Message showing up after trying to call foreign key, that is a primary key in another table. There's two tables and whats supposed to link them is the foreign key. The SQL Server database does not allow, making the identity of both the primary key and the foreign key [...] read more

Wrap ef core database update in a transaction

My recent database update failed in the middle of a migration, leaving the database inconsistent: > dotnet ef database update Applying migration '20200429031727_NewRequisitesAndCountry'. Failed executing DbCommand (97ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] [...] Microsoft.Data.SqlClient.SqlException (0x80131904): Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, [...] read more

Can't get local DB to work with application when on another PC

So I have this application I wrote as a little project for work. It uses a single database table that was set up within Visual Studio along with the application itself. And while it runs perfectly fine on my own laptop, I can't get it to work on another PC. [...] read more

how to fix The system cannot find the file specified error in ASP.NET MVC and sql server 2019

i create code first application but i running app receive this error and it doesnt make db using sql server 2019 please help me i cant run Server Error in '/' Application. The system cannot find the file specified Description: An unhandled exception occurred during the execution of the current [...] read more

How to check if database creation in LocalDB is finished

I work on a project with uses SQL Server as database together with Entity Framework Core 3.1. For the unit tests / integration tests we use LocalDB. To ensure the LocalDB database is in the correct migration state, we drop and recreate the test database. This looks something like this: [...] read more

Creating an Entity with multiple one-to-many relationship and a DeleteBehavior

I'm using EntityFramework Core version 2.2. I have three entities: Team, Player and Notes. Each team can have a note for each player, so a player may have multiple team that took a note on him. A note can have only one team and one player. public class Team { [...] read more

Cannot connect to MySQL database from Monodevelop in Linux Mint

I can't connect to a MySQL database from C#. Upon trying to run the executable it spits out this error (this is the beginning of it): Unhandled Exception: System.Data.SqlClient.SqlException (0x80131904): Snix_Connect (provider: SNI_PN7, error: 40 - SNI_ERROR_40) Snix_Connect (provider: SNI_PN7, error: 40 - SNI_ERROR_40) at System.Data.SqlClient.SqlInternalConnectionTds..ctor (System.Data.ProviderBase.DbConnectionPoolIdentity identity, System.Data.SqlClient.SqlConnectionString connectionOptions, [...] read more

Using stored procedures with web service in Xamarin

I am working in Xamarin Form ... I create web service ASMX and SQL Server Database, and it works properly. But when I replaced the query by stored procedures there is an error. what I do : First of all, I create class its name DBConnection.cs for connection string public [...] read more

Entity Framework Fluent API - Cascade Delete - With Interface

I've got the following relationships defined in my data model / Entity Framework-driven (EFCore) database: 1. A Person.cs which implements the IRecord interface. A Person has a List of ExternalId.cs objects. 2. The ExternalId.cs class has an inverse property back to the IRecord interface. This is a one-to-many relationship (one [...] read more

Deploy ASP.NET MVC app on Azure portal with SQL database

How I can move my local database in project in order that I can deploy this database to Azure? Know on Azure when I login I get an error: > Error: an error occurred while processing your request It is because I have no connection to my database. I have [...] read more

Fatal NServiceBus exception when starting endpoint, cannot open database

We just made some changes to our project and deployed it. We have 7 endpoint databases in our SQL Server database for NServiceBus. We recently added 2 more. One of the two services using one of the two new endpoints fails to start. When looking at our log file we [...] read more

Deleting a listing in table throws a SQL error

I have a .NetCore Entity Framework project for a model airport. When I try to delete an airport in the listings, I am getting the error below when trying to delete an airline and I'm trying to figure out why: Microsoft.Data.SqlClient.SqlException (0x80131904): The DELETE statement conflicted with the REFERENCE constraint [...] read more

Error Invalid object name attempt to connect to a non-existent database table

I’m doing a diplom project on the Acp.Net core mvc 5 platform. I created a role provider. I try in the method public override string [] GetRolesForUser (string username) to get user roles, here is the method itself public override string[] GetRolesForUser(string username) { string[] roles = new string[] { [...] read more

Azure database works on localhost, but not when used with azure service app

So I've been trying to publish my first project to azure. I've got everything set-up, a service app and a sql database. My initial page loads properly(It's the standard view for a .net core web application). The first thing I need to do is register a new user. Whenever I [...] read more

Can't access Azure sql with EF Core - Code first, but can with database first

so as the title suggests. I have done the following: Created simple models (c# classes). Added Nugget packages: - Microsoft.EntityFrameworkCore.Design(3.1.3) - Microsoft.EntityFrameworkCore.SqlServer(3.1.3) I Have added the following context: namespace PriceCalendarService.Data { public class DataContext : DbContext { public DataContext(DbContextOptions<DataContext> options) : base(options) { } public DbSet<Item> Items { get; set; [...] read more

EF Core 2: The MERGE statement conflicted with the FOREIGN KEY constraint

I have following classes: public class GSProject { public int Id { get; set; } public ICollection<GSPoint> Points { get; set; } public ICollection<GSPlanarSurface> PlanarSurfaces { get; set; } } public class GSPoint { public int Id { get; set; } public int? PlanarSurfaceId { get; set; } public GSPlanarSurface [...] read more

How to fix EF Core database errors after extending IdentityUser in ASP.NET Core 3.1?

I've built a web app in ASP.NET Core 3.1, using Entity Framework Core 3.1 as well, and am now trying to Publish it to Azure. However, at the point in development when I extended the built-in IdentityUser class with a custom ApplicationUser class, my EF migrations stopped posting to the [...] read more

Select table using ListBox

I'm trying to read tables in an SQL statement. The names of the Tables, are pulled in a listbox. Users will select the name of the table they want to view the data for, and in turn my method will read+visualize+export that table. The issue is with the name of [...] read more

EF Core Code-First Migration Changing Primary Key from Int to Long Failed

I'm using Dotnet Core 3.1 with Entity Framework Core 3.1.3 using Code-First with Azure SQL Database. During the development, I want to change the Primary Key of a table from int to long from the Model class in dotnet core project and use add-migration. However, when using Update-Database, there are [...] read more

Installation 2SexyContent in Dnn Portal (dnnSoftware)

When I install 2sxc in DnnSoftware in recent versions I got the following error message. My provider has SQL Server switch to "czech_CI_AS" I can´t this change to US-language. Does anyone have advice? SqlDataProvider Info Created - SqlDataProvider\00.99.00.SqlDataProvider Info Executing 00.99.00.SqlDataProvider Info Start Sql execution: 00.99.00.SqlDataProvider file Failure SQL Execution [...] read more

C# - SQL Server: INSERT statement conflicted with FOREIGN KEY constraint - Unhandled Exception

I wrote a small C# application, which reads an Excel file and should import the data into an existing SQL Server database. As there is a foreign key constraint in the table the entries should be inserted to, I already prevented this error directly in my SQL query by using [...] read more

How to attach mssql database using relative path?

Sorry if this's been already asked! I am able to attach a mssql database on button click using this code: using (SqlConnection connection = new SqlConnection(@"Data Source=.\SQLEXPRESS;Initial Catalog=;Integrated Security=True; MultipleActiveResultSets = true")) { using (SqlCommand cmd = new SqlCommand("", connection)) { using (SqlCommand cmd1 = new SqlCommand("", connection)) { try [...] read more

Not able to search a document library on sharepoint with more than 500 records

I am using sharepoint 2016 online. My document library has more than 500 documents. I am trying to fetch records with the below caml query : <View><Query><Where><And><Eq><FieldRef Name='ContextId'/><Value Type='Integer'>xxxxxxxx</Value></Eq><Eq><FieldRef Name='NumericRecordId'/><Value Type='Integer'>xxxxx</Value></Eq></And></Where></Query</View> var list = context.Web.Lists.GetByTitle(listName); var collection = list.GetItems(query); context.Load(collection); context.Load(collection, f => f.Include(i => i.File)); context.ExecuteQueryWithIncrementalRetry(); return from c [...] read more

ASP.NET Core 3 EF Framework - transient failure when running lots of queries

I am using EF Core for an ASP.NET website. In one method I have about 7 complex queries similar to (simple example): var query1 = context.Playarea .Include(x => x.Cats) .Where(x => x.Cats.Any()) .SelectMany(x => x.Cats.Select(y => new MyClass(x.Id, y.Name, y.Age))).ToList(); var query2 = context.Playarea .Include( x => x.Dogs) .Where(x => [...] read more

Published windows app not connecting to LocalDB

I have a windows application in C#, works fine on my laptop even when published but as soon as I send it to another machine, it gives this error "System.Data.SqlClient.SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or [...] read more

ASP.NET Core - cannot "dotnet ef database update" to migrate, but CL throws "CREATE DATABASE permission denied in database 'master'."

I am trying to create a database and connect it with my ASP.NET Core app. I am using Mac, so the setup I followed is this tutorial, https://www.ciclosoftware.com/2018/03/14/sql-server-with-net-core-and-entityframework-on-mac/ When I use "dotnet ef database update" in my command line, I get errors saying Failed executing DbCommand (19ms) [Parameters=[], CommandType='Text', CommandTimeout='60'] [...] read more

Access/Query SQLServer within Docker on Mac using c#/visual studio

I am new to development and C# - working on a MAC with Visual Studio Community - I installed Docker and installed MSSQL Linux within Docker. I created a database, added tables using Azure Data Studio. I can query the database from Azure. I want to connect to the SQL [...] read more

dbup for Azure sql datawarehouse?

Does Dbup support the azure datawarehouse DB? When i tried to run the c# console project, even for select statement, i am getting the below error, any advice appreciated? is there any alternative sql automation version like dbup, apart from dacpac. [error]Script block number: -1; Message: Enforced unique constraints are [...] read more

Trouble connecting to DB in .NET Core app while following tutorial

Ok, here's my issue. I'm following the tutorial here: https://docs.microsoft.com/en-us/aspnet/core/data/ef-rp/intro?view=aspnetcore-2.2&tabs=visual-studio And when I get to the section where you first test the app, I get a connection error for my database. I haven't touched the connection string (the tutorial doesn't say to). But the error I get is this (through [...] read more

provider: SSL Provider, error: 0 - An existing connection was forcibly closed by the remote host

In short, I wrote a console app that just calls a stored procedure in a SQL Server database. Then setup a Windows Task Scheduler event to call the console app's .exe file every 5 minutes. Most of the time it works, however about 10 times a day or so we [...] read more

Error on UWP trying to connect to SQL Server Express via EFCore

Team, this is driving me crazy. I always receive this error when I start the UWP application: > Microsoft.Data.SqlClient.SqlException: 'A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that [...] read more

ASP.NET machinekey settings causing error on Firefox but working on Internet Explorer

Previously we are experiencing frequent "Validation of viewstate MAC failed." error. Our app is deloyed on a web farm, and we found out that to fix this we should add machinekey settings on our web.config. After adding machinekey settings to our config, On Firefox, we are now experiencing an error [...] read more

MS SQL Server with EF Core 'Introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths' with Delete Behavior SetNull

I really thought I'd understood the EF Core delete behavior constraints concerning MS SQL Server, but obviously I don't :-( Introducing a foreign key with delete behavior "set null" leads to the following exception when updating the database: > ALTER TABLE [AppointmentParticipations] ADD CONSTRAINT [FK_AppointmentParticipations_SelectValueMappings_ResultId] FOREIGN KEY ([ResultId]) REFERENCES [SelectValueMappings] [...] read more

LocalDB connection string to v14 SQL

I created a DB like this: C:\Users\user>sqllocaldb create demo LocalDB instance "demo" created with version 14.0.1000.169. C:\Users\user>sqllocaldb info demo Name: demo Version: 14.0.1000.169 Shared name: Owner: PC\user Auto-create: No State: Running Last start time: 13/03/2020 11:11:43 Instance pipe name: C:\Users\user> I Can connect to it with SQL Server 2017 Management [...] read more

SqlDataReader Item property loses connection

I have this large SQL Server query (legacy) over several tables, that I read with a SqlDataReader. It usually has a limited number of rows to handle, but recently I had to use it over a larger number. After a number of iterations, the SqlDataReader object, on reading an Item() [...] read more

Full Text Search on ValueObject in same Table generates incorrect query

I have an existing table using a valueobject placed into the same table. A full text index has been placed on the fields in the table from the valueobject, but when using EF.Function.Contains EF generates a query that fails with Sql Exception. ValueObject public class Address { [Required] [MaxLength(50)] public [...] read more

.NET CORE 3 With Angular 9 loading extremely slowly

I've bought the book ASP.NET CORE 3 and Angular 9 third edition and am currently reading it and coding along. I do however have a problem, when I launch the app (pressing F5 from visual studio 2019) every request to the server is extremely slow (it can take 25 seconds [...] read more

Windows Authentication: Login failed for user 'DOMAIN\MACHINE$'

I have seen many posts with the exact same error: > Microsoft.Data.SqlClient.SqlException (0x80131904): Login failed for user ' DOMAIN\MACHINE$'. but the origin from this exception coud be quite different for each case, here is the explanation of mine: I am building an API using asp.net core 3.1, the idea is [...] read more

The wait operation timed out in devexpress report

Description: > An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.ComponentModel.Win32Exception: The wait operation timed out Source Error: Line 1399: dataTable.Clear(); Line 1400: } Line 1401: [...] read more

Need help deploying an ASP.NET WebApp that uses EF6 on an IIS server on another computer

I'm currently just a begginer with ASP.NET. I've implemented a Webapp that uses EF6 on a computer A. I now have to deploy it on an IIS server on another computer (Let's call it computer B). Whenever I try to access a web page for which it's controller need access [...] read more

I am not able to rectify this following error : System.Data.SqlClient.SqlException (0x80131904): Invalid column name 'OAT'

protected void btnDeleteVenue_Click(object sender, EventArgs e) { try { con.Open(); string ddl = DropDownList1.SelectedItem.Value; string sq = "select venue_name from Venue"; cmd = new SqlCommand(sq, con); SqlDataReader r = cmd.ExecuteReader(); string dq = null; if (r.HasRows) { while (r.Read()) { if (ddl.Equals(r.GetValue(0).ToString())) { string dq = "DELETE from Venue WHERE [...] read more

Does docker compose does not start services in parallel

I guess docker-compose up can start multiple services in parallel (REF). I have an application that depends on multiple services (e.g., database). The application is implemented in ASP.NET Core, and uses Polly for resiliency; e.g., wait for database for a certain time intervals, if a given exception is thrown, re-try [...] read more

Cannot access ADLS from Synapse Analytics

I have; 1. A master key. 2. A database scoped credential. 3. An external data source. 4. File format. 5. A user created managed identity for Azure SQL Server. 6. RBAC contributor permission for that managed identity on my ADLS storage account. When I execute the code to create an [...] read more

SQL server Microsoft.Data.SqlClient.SqlException (0x80131904): Execution Timeout Expired on azure

I am using external SQL Server to host our database and ASP.NET MVC Core application is hosted on Azure. Locally on Dev machine, the Web application works fine when a complex query executed but on Azure I get an exception Microsoft.Data.SqlClient.SqlException (0x80131904): Execution Timeout Expired I am using the same [...] read more

The target principal name is incorrect. Cannot generate SSPI context. in .Net MVC

I have deployed my application in AWS. When I run the application, it seems working but the problem is when I am trying to register or login. It throws error: > Server Error in '/' Application. The target principal name is incorrect. Cannot generate SSPI context. Description: An unhandled exception [...] read more

Connecting to remote sql server from dot net core from linux sometimes fails, then starts working randomly

I have a C# dotnet core 3.1 Asp.net MVC Application running on Ubuntu 18.04. It connects to a remote Sql Server running on Windows Server 2016 using Entity Framework. Most of the time, the connection and queries work fine. However, once in a while, especially if the connection application has [...] read more

Convert string to HierarchyId in Fluent API (EF Core) using "HasConversion()" or any other method?

I am using FileTables with EF Core Code First approach. I have used stored procedure to get the Path_Locator (PK) from FileTable (named as 'DocumentStore') in string and now attempting to insert the same in another table where I store information about that file. I have manually added the Foreign [...] read more

SQL Server 2008 - Intermittent error 18456 with sa

I have an application that uses a group of SQL 2008 databases. For some reason, the main database intermittently throws a series of 18456 errors (Login failed - failed to open the explicitly specified database). This causes the application to wig out and often crash. In the SQL server logs, [...] read more

Sql Server: timeout connection

I have a problem of this type on the code below, when I try to execute it I am shown the following error. How can I go about solving this? What is this due to? this series of code allows the implementation of the query within a c # program. [...] read more

UmbracoCms ends up with error: This SqlTransaction has completed; it is no longer usable

I've installed UmbracoCms 8.5.3 (and tried some older versions as well) package on an Empty ASP.NET Web Application (.NET Framework 4.7.2) in VS 2019 v. 16.4.5. I can install it completely when default SQL CE is selected on installation process. But if I try to install it with SQL Server [...] read more

SSIS Catalog DB Execution - Connection Timeout Expired Issue

Need some help on the SSIS packages execution. We have around 20 packages that are executed all the same time (7:00 PM). Microsoft (R) SQL Server Execute Package Utility Version 13.0.5598.27 for 64-bit Copyright (C) 2016 Microsoft. All rights reserved. Started: 6:19:12 PM Failed to execute IS server package because [...] read more

Pre-Login Handshake error when attempting to connect to SQL Server from .Net Core App in Linux

I'm trying to connect to a Sql Server database with a .Net Core server application running under Linux. According to the error, the connection is successful, but an error occurs during the "Pre-login handshake". This is not he result of a delay, I get the error immediately. Most of the [...] read more

Error "cannot find the file specified" when connecting to Azure SQL

I have developed an ASP.NET application which I deployed on Azure. I did connect my program to a database (and properly changed the Connection String). I followed this tutorial until the migration part, and yet I have the following error: The system cannot find the file specified Description: An unhandled [...] read more

DNN Error: DotNetNuke.Site ExportImport Installation failed while upgrade CMS from versions 9.1 to 9.3

I am getting this error message when upgrading site from 9.1 to 9.3.1. Can Does someone suggest how to get rid of this error? StartJob Starting Installation Info Starting Installation - SiteExportImport Info Starting Installation - Assembly Info Assembly already registered - bin\DotNetNuke.SiteExportImport.dll Info Creating backup of previous version - [...] read more

Having issue with DNN 6 upgrade network path

So we are upgrading site and came across interesting problem. We have a 6.01 version we are using upgrade path upgrades. Going to 6.4 then 7 to 8 to 9 etc etc. So far other version 7 sites upgrade fine, the version 6 sites as stated above fails. PLEASE NOTE: [...] read more