Sunday, January 25, 2009

Restrict Multiple Instance of Visual Basic Application

How to Prevent Visual Basic Exe being executed multiple times

At times we set/reset registry settings / environment variables as part of the program logic. If another instance of the application uses this concurrently it would become a mess. The best is to prevent the application from being loaded for the second time. The easy way to do is to use App.PrevInstance method as shown below.

If App.PrevInstance = True Then

MsgBox "An instance of this tool is running in this machine! Requested instance will terminated", vbExclamation

Exit Sub

End If

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