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VB.NET Language in a Nutshell, Second Edition by Steven Roman PhD, Paul Lomax, Ron Petrusha

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Name

AddHandler Statement

Syntax

AddHandler NameOfEventSender, AddressOf NameOfEventHandler
NameOfEventSender (required; String literal)

The name of a class or object instance and its event, such as Button1.Click

NameOfEventHandler (required; String literal)

The name of a subroutine that is to serve as the event handler for NameOfEventSender

Description

Binds an event handler to a built-in or custom event. This makes it possible to bind several event handlers to a single event.

  • NameOfEventSender takes the form class.event or object.event.

  • You can stop handling events defined by the AddHandler statement by calling the RemoveHandler statement.

Example

For an illustration, see Section 7.2.3 in Chapter 7.

Programming Tips and Gotchas

The Handles keyword can be used to receive event notification for the lifetime of an object. In contrast, AddHandler and RemoveHandler can be used to dynamically add and remove event notification at runtime.

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