How can I get an error message that happens when using ExecuteNonQuery()?

Question

I am executing a command in this way :

var Command = new SqlCommand(cmdText, Connection, tr);

Command.ExecuteNonQuery();

In the command th

Answer 1

.NET does indeed raise an error message... if the severity is 16 or above (since it throws an exception) - the message will be in the exception .Message. If you are using RAISERROR with a lower severity (or using PRINT) then you will have to subscribe to the InfoMessage event on the connection.

Answer 2

this code when the command is finsth, combine with try cath, return the error:

SqlCommand.EndExecuteNonQuery(result) 

and this is my full class code:

Imports System.Data.SqlClient
Imports System.DirectoryServices.ActiveDirectory

Class clsExecuteAsync


    Public Event EnProceso(Identificador As Integer, Mensaje As String)
    Public Event Finalizado(IDentificador As Integer, Mensaje As String)
    Public Event CancelarProcesoEnEjecucion(Identificador As Integer, ByRef Cancel As Boolean)



    Dim Cancelar As Boolean

    Sub CancelarProceso()
        Cancelar = True
    End Sub


    Function test() As Boolean
        ' This is a simple example that demonstrates the usage of the
        ' BeginExecuteNonQuery functionality.
        ' The WAITFOR statement simply adds enough time to prove the
        ' asynchronous nature of the command.
        Dim commandText As String = "UPDATE Production.Product SET ReorderPoint = ReorderPoint + 1 " & "WHERE ReorderPoint Is Not Null;" & "WAITFOR DELAY '0:0:3';" & "UPDATE Production.Product SET ReorderPoint = ReorderPoint - 1 " & "WHERE ReorderPoint Is Not Null"
        Return (RunCommandAsynchronously(0, commandText, GetConnectionString()))
        Console.WriteLine("Press ENTER to continue.")
        Console.ReadLine()

    End Function

    Function ExecuteAsync(Identificador As Integer, Sql As String, Optional CadenaConexion As String = "") As String
        If CadenaConexion = "" Then
            CadenaConexion = clsIni.LeeIni("Provider")
        End If

        Return RunCommandAsynchronously(Identificador, Sql, CadenaConexion)

    End Function

    Function RunCommandAsynchronously(Identificador As Integer, commandText As String, connectionString As String) As String
        ' Given command text and connection string, asynchronously execute
        ' the specified command against the connection. For this example,
        ' the code displays an indicator as it is working, verifying the
        ' asynchronous behavior.
        Dim Resultado As String = ""
        Try

            Dim connection As SqlConnection
            Dim SqlCommand As SqlCommand

            connection = New SqlConnection(connectionString)
            Dim count As Integer = 0

            'testint to catch the error, but not run for me
            AddHandler connection.InfoMessage, AddressOf ErrorEnConexion


            SqlCommand = New SqlCommand(commandText, connection)
            connection.Open()
            Dim result As IAsyncResult = SqlCommand.BeginExecuteNonQuery()
            While Not result.IsCompleted
                Console.WriteLine("Waiting ({0})", count = count + 1)
                ' Wait for 1/10 second, so the counter
                ' does not consume all available resources
                ' on the main thread.
                System.Threading.Thread.Sleep(100)
                RaiseEvent EnProceso(Identificador, commandText)
                Application.DoEvents()

                If Cancelar Then
                    Cancelar = False

                    'cancelar 
                    Dim Cancel As Boolean = False
                    RaiseEvent CancelarProcesoEnEjecucion(Identificador, Cancel)

                    If Cancel = False Then
                        Resultado = "Cancelado"
                        GoTo SALIR
                    End If

                End If

            End While

            'Console.WriteLine("Command complete. Affected {0} rows.", Command.EndExecuteNonQuery(Result))

            '   MsgBox("El comando se ejecutó. " & SqlCommand.EndExecuteNonQuery(result), MsgBoxStyle.Information)

            'detect error: this code lunch and error: Cath with try cacth code
            SqlCommand.EndExecuteNonQuery(result)

            RaiseEvent Finalizado(Identificador, SqlCommand.EndExecuteNonQuery(result))

            Resultado = "OK"

        Catch ex As SqlException
            Console.WriteLine("Error ({0}): {1}", ex.Number, ex.Message)
            Resultado = ex.Message


        Catch ex As InvalidOperationException
            Console.WriteLine("Error: {0}", ex.Message)
            Resultado = ex.Message
        Catch ex As Exception
            ' You might want to pass these errors
            ' back out to the caller.
            Console.WriteLine("Error: {0}", ex.Message)
            Resultado = ex.Message
        End Try


SALIR:
        Return Resultado

    End Function

    Private Sub ErrorEnConexion(sender As Object, e As SqlInfoMessageEventArgs)
        MsgBox(e.Message)

    End Sub


    Private Function GetConnectionString() As String
        ' To avoid storing the connection string in your code,
        ' you can retrieve it from a configuration file.
        ' If you have not included "Asynchronous Processing=true" in the
        ' connection string, the command is not able
        ' to execute asynchronously.
        Return "Data Source=(local);Integrated Security=SSPI;" & "Initial Catalog=AdventureWorks; Asynchronous Processing=true"

    End Function


End Class