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Vb.net 2010 AddHandler, AddressOf

Posted on 2010-11-22
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In which situations is utilized, or what the purpose of AddHandler, AddressOf
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Question by:rflorencio
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Erick37 earned 2000 total points
ID: 34191114
To assign an event handler to an event.

Normally in VB.Net when you select a control event, it is attached using the Handles keyword:

e.g.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

You could also assign the event programmatically using this:

AddHandler Button1.Click, AddressOf Button1_Click


This is useful when you need to control when the event is handled or if you ever need to remove the event (using RemoveHandler).

I often use AddHandler to programmatically assign the XXX_Changed event to databound controls to prevent the events from firing until after the control is loaded and databound.
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