A: The method DoEvents() will handle this requirement. By placing a call to DoEvents at the top of the loop, this method will process all messages queued from the Operating System, including shutting down the application. Using the DoEvents() method requires a reference to System.Windows.Forms.dll. Furthermore, the DoEvents() method is found in the class System.Windows.Forms.Application.
Private Sub btn1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn1.Click
Dim intCounter as Integer
For intCounter = 1 To 1000
DoEvents() 'located in System.Windows.Forms.Application
'Processing Procedure here