hey,I have two buttons Start button and Stop button .I run my program by clicking on start button. I want to stop the program during the start button . But the program will not responde until the start buttun finish its job. How i can do check the stop buttun during the start. i heard about threading but i do not know how i can do it. Please

  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click, Button3.Click
 //my code
 //check always if the user push stop if no continue if yes go to this sub
 //my code
 end sub

     Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

        stopClick = True

        Dim Response As Integer

        Response = MessageBox.Show("Do you really want to exit?", "", MessageBoxButtons.YesNo, MessageBoxIcon.Question)

        If Response = vbYes Then


        End If

    End Sub

Have you tried if application.doevents works for you? I've never used it in vb.net, but in vba it would do what you expect.

Look at the documentation here : http://msdn.microsoft.com/en-us/library/system.windows.forms.application.doevents(v=vs.110).aspx

Not sure it's "best pactices" though.

You're better off use threads and the "backgroundworker". See if this http://msdn.microsoft.com/en-us/library/vstudio/system.componentmodel.backgroundworker works for you and let us now.

Good luck.

In the last week or so I posted a new tutorial on creating and managing background threads. You can find it here.