hello all when i run any block of code in my vb2005 project the application exit the run time


example
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
msgbox ("hello word")
End Sub


after press button i exit immidiatly
plz why and how to fix it
this case just in one project not in all project
and thanx