Async Web Services

Using Async Web Services behind a Form

If a call has been made it is possible that the windows form might have been closed before the result has been returned
At the top of all your _Callback subroutines you need to add the following line:

If (Me.Disposed = True) Then Exit Sub 

You must also make sure the form is disposed before it is closed

Private Sub Form_Close() 
   Me.Dispose() 
   Me.Close() 
End Sub