Private Sub ReloadCaptcha(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnReloadcaptcha.Click
        DisposeThread(myThread)
        myThread = New Thread(New ThreadStart(AddressOf RefreshCaptcha))
        myThread.Start()
    End Sub

    Private Sub ValidateCaptcha(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnValidateCaptcha.Click
        DisposeThread(myThread)
        myThread = New Thread(New ParameterizedThreadStart(AddressOf ProcessCaptcha))
        myThread.Start(Me.txtCaptcha.Text)
    End Sub