Textbox doesn't get updated while threading

Question

Here is a sub code inside a module named \"Blahing\":

    Sub BlahBlah(ByVal Count As Long)
        For i As Long = 0 To Count
            frmBlaher.txtBlah.Appe         


        

Answer 1

This is because you are trying to update a control from a thread other than the one which created it. You can get past this with the Control.Invoke and Control.InvokeRequired methods. Control.Invoke will run the passed in delegate on the thread which created the Control.

I don't work with VB at all but you could try something along the lines of this:

Delegate Sub BlahBlahDelegate(ByVal Count As Long)

Sub BlahBlah(ByVal Count As Long)
    If frmBlaher.txtBlah.InvokeRequired Then
        Dim Del As BlahBlahDelegate
        Del = new BlahBlahDelegate(AddressOf BlahBlah)
        frmBlaher.txtBlah.Invoke(Del, New Object() { Count })
    Else
        For i As Long = 0 To Count
            frmBlaher.txtBlah.AppendText("Blah")
        Next
    End If
End Sub