Insert data into a SQL Server database using vb.net

I create a SQL Server database and I want to add some data in a particular table of that database. I use some textbox to input the data and an add button to complete. But when I tap the button the whole process was stopped and indicate an error in the DBSQL module which is shown below.

Here's my code:

Imports System.Data
Imports System.Data.SqlClient

Module DBSQLServer
    Public con As New SqlConnection("Data Source=JOYALXDESKTOP\SQLEXPRESS;Initial Catalog=SaleInventory;Integrated Security=True")
    Public cmd As New SqlCommand
    Public da As New SqlDataAdapter
    Public ds As New DataSet
    Public dt As DataTable
    Public qr As String
    Public i As Integer

    Public Function searchdata(ByVal qr As String) As DataSet
        da = New SqlDataAdapter(qr, con)
        ds = New DataSet
        da.Fill(ds)
        Return ds

    End Function

    Public Function insertdata(ByVal qr As String) As Integer

        cmd = New SqlCommand(qr, con)
        con.Open()
        i = cmd.ExecuteNonQuery()
        con.Close()
        Return i

    End Function
End Module

The error occurs on this line:

i = cmd.ExecuteNonQuery()

The error is:

System.Data.SqlClient.SqlException: 'Incorrect syntax near ')'

Here's my add button code:

Private Sub Add_Click(sender As Object, e As EventArgs) Handles add.Click
        If (isformvalid()) Then
            qr = "Insert into tblProductInfo (ProName, ProDesc, ProPrice, ProStock) Values('" & nametext.Text & "','" & descriptiontext.Text & "','" & pricetext.Text & "','" & stocktext.Text & "',)"
            Dim logincorrect As Boolean = Convert.ToBoolean(insertdata(qr))
            If (logincorrect) Then
                MsgBox("Stock Added Successfully ...", MsgBoxStyle.Information)
            Else
                MsgBox("Something Wrong. Record Not Saved. Please Check and Try Again...", MsgBoxStyle.Critical)
            End If
        End If
    End Sub

When I copy the details of that error it shows:

System.Data.SqlClient.SqlException
HResult=0x80131904
Message=Incorrect syntax near ')'.
Source=.Net SqlClient Data Provider

StackTrace:

at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action1 wrapCloseInAction)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action1 wrapCloseInAction) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async, Int32 timeout, Boolean asyncWrite) at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at InventoryManagement.DBSQLServer.insertdata(String qr) in C:\Users\Joy Alx\source\repos\InventoryManagement\InventoryManagement\DBClass\DBSQLServer.vb:line 25 at InventoryManagement.stock.Add_Click(Object sender, EventArgs e) in C:\Users\Joy Alx\source\repos\InventoryManagement\InventoryManagement\Screens\Tools\stock.vb:line 29 at System.Windows.Forms.Control.OnClick(EventArgs e) at Bunifu.Framework.UI.BunifuImageButton.OnClick(EventArgs e) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg) at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData) at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun() at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel() at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine) at InventoryManagement.My.MyApplication.Main(String[] Args) in :line 81

If I have done anything wrong to ask this type question, I am sorry. I am new in this community.Thanks in advance.

There's issue with your query :

qr = "Insert into tblProductInfo (ProName, ProDesc, ProPrice, ProStock) Values('" & nametext.Text & "','" & descriptiontext.Text & "','" & pricetext.Text & "','" & stocktext.Text & "',)"

Should be

qr = "Insert into tblProductInfo (ProName, ProDesc, ProPrice, ProStock) Values('" & nametext.Text & "','" & descriptiontext.Text & "','" & pricetext.Text & "','" & stocktext.Text & "')"

Imagine SQL query being like this :

Insert into tblProductInfo (ProName, ProDesc, ProPrice, ProStock) Values('[name]','[description]','[price]','[stock]',)

and

Insert into tblProductInfo (ProName, ProDesc, ProPrice, ProStock) Values('[name]','[description]','[price]','[stock]')

Edit : Also I have to agree with colleagues - use parametarised queries or stored procedures - that would prevent SQL Injection. Also make sure that you are validating inputs before pushing them to db - pushing text to int field will fail.