check form closing by windows station using System.Diagnostics.StackTrace

hi all, just got another problem in my application :(, its a client-server application, where i want to disable the user from closing the application in the main window. I'm using VS.NET 2003 environment, the codes:

    Private Sub Form1_Closing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing
        Dim formStackTrace As System.Diagnostics.StackTrace = New System.Diagnostics.StackTrace(True)
        Dim formStackFrame As System.Diagnostics.StackFrame

        formStackFrame = formStackTrace.GetFrame(7)
        Select Case formStackFrame.GetMethod.Name.ToString
            Case "CallWindowProc"
                e.Cancel = True
                NotifyIcon1.Visible = True
                Me.Hide()
            Case Else
                If connectionProblem Then
                    Exit Sub
                Else
                    Try
                        SendData("LOGON|" + computerName + "|" + hostName + "|Logoff|" + Today() + "," + TimeOfDay() + "|" + hostIP + "|")
                    Catch ex As Exception
                        MsgBox("Sending of logon data has been failed.", MsgBoxStyle.OKOnly Or MsgBoxStyle.Critical)
                    End Try
                End If
        End Select
    End Sub

by using the code above, i can stop the user from closing the main window, but now the problem is the client side is unable to one last data back to the server. when i try to shutdown the window, window is unable to stop the application as well, except i stop it in the task manager and by end it tat way the client will able to send the data back to server before it is closed. is the there any way i can know tat the windows is shutting so that i can allow the application to exit and send the data back to server? or is there any other case in System.Diagnostics.StackTrace can check that the application closing is denoted by the windows station? but since i already put the case else in my code then it should be work as expected, except there is no such case that application closing is denoted by windows station. Any ideas?Start Free Trial