My connectionstring is erroring on its own generated connection string. how would i fix this?

first time working with DB/SQL in Visual Studios 2017 So i created my own Database in with a table inside of it Now i want my code to connect to the DB and i used the generated connectionString but now i am getting errors like :System.Data.SqlClient.SqlException

That something on my connection OPEN is going wrong

namespace WindowsFormsApp2
{
    class DBConnect
    {
        public void connectDB()
        { 
            SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB; AttachDbFilename = C:\Users\xflak\OneDrive\Documenten\GitHub\ItemDatabase - UI\WindowsFormsApp2\Database1.mdf; Integrated Security = True");
            try
            {
                con.Open();
                Console.WriteLine("Connection Open!");
            }catch(Exception ex)
            {
                Console.WriteLine(ex.StackTrace);
            }
        }
    }
}

OLD Stacktrace

Exception thrown: 'System.Data.SqlClient.SqlException' in System.Data.dll
   bij System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, DbConnectionPool pool, String accessToken, Boolean applyTransientFaultHandling)
   bij System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
   bij System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)
   bij System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
   bij System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
   bij System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   bij System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   bij System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   bij System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   bij System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   bij System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
   bij System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
   bij System.Data.SqlClient.SqlConnection.Open()
   bij WindowsFormsApp2.DBConnect.connectDB() in C:\Users\xflak\OneDrive\Documenten\GitHub\ItemDatabase-UI\WindowsFormsApp2\DBConnect.cs:regel 17

New Stacktrace with SqlException en ex.ToString();

Exception thrown: 'System.Data.SqlClient.SqlException' in System.Data.dll
System.Data.SqlClient.SqlException (0x80131904): An attempt to attach an auto-named database for file C:\Users\xflak\OneDrive\Documenten\GitHub\ItemDatabase - UI\WindowsFormsApp2\Database1.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.
   bij System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, DbConnectionPool pool, String accessToken, Boolean applyTransientFaultHandling)
   bij System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
   bij System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)
   bij System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
   bij System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
   bij System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   bij System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   bij System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   bij System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   bij System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   bij System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
   bij System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
   bij System.Data.SqlClient.SqlConnection.Open()
   bij WindowsFormsApp2.DBConnect.connectDB() in C:\Users\xflak\OneDrive\Documenten\GitHub\ItemDatabase-UI\WindowsFormsApp2\DBConnect.cs:regel 17
ClientConnectionId:200efe66-c5b0-4085-acb2-67a1c554ed67
Error Number:15350,State:1,Class:14

The relevant part is:

SqlException (0x80131904): An attempt to attach an auto-named database for file C:\Users\xflak\OneDrive\Documenten\GitHub\ItemDatabase - UI\WindowsFormsApp2\Database1.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.

Try it without AttachDbFilename and as initial catalog put your database name.

SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB; Initial Catalog=Your database name ; Integrated Security = True")