How can I define a "Change" event for a variable?

From: "Javad" <Javad@xxxxxxxxx>
Date: Sat, 2 Dec 2006 02:35:44 +0330

Hello

I have a variable such as "Num1", and now I want whenever the value of this variable changes, something happens. For example something like this:

Public Sub Num1_Change()
MsgBox "Number 1 Changed"
End Sub

How can I do such a thing?
Thank you

.

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