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Events in Visual Basic

Visual Studio 2008

An event is a message sent by an object announcing that something has happened. Events are implemented using delegates, a form of object-oriented function pointer that allows a function to be invoked indirectly by way of a reference to the function.

In This Section

Events and Event Handlers: Provides an overview of events, event handlers, and associated terminology.
WithEvents and the Handles Clause: Demonstrates how to use the WithEvents keyword and the Handles clause to associate an event with an event handler.
AddHandler and RemoveHandler: Demonstrates how to use the AddHandler and RemoveHandler statements to dynamically associate an event with an event handler.
How to: Add Events to a Class: Describes the process of defining events.
How to: Create Event Handlers in the Visual Basic Code Editor: Gives directions for using the Visual Basic Code Editor to write code to respond to events.
How to: Raise an Event (Visual Basic): Demonstrates how to define an event and uses the RaiseEvent statement to cause the event to occur
How to: Create an Event and Handler (Visual Basic): Demonstrates how to define an event and an event handler, and how to use the AddHandler statement to associate them.
How to: Write Event Handlers: Demonstrates how to write event handlers using the Handles clause or the AddHandler statement.
How to: Handle Events in Visual Basic: Defines a class that raises an event when you call the CauseEvent method.
Walkthrough: Declaring and Raising Events: Provides a step-by-step description of how to declare and raise events for a class.
Walkthrough: Handling Events: Demonstrates how to write an event-handler procedure.
How to: Declare Events That Avoid Blocking: Demonstrates how to define a custom event that allows its event handlers to be called asynchronously.
How to: Declare Events That Conserve Memory Use: Demonstrates how to define a custom event that uses memory only when the event is handled.
Troubleshooting Inherited Event Handlers in Visual Basic: Lists common issues that arise with event handlers in inherited components.

Related Sections

Delegates in Visual Basic: Provides an overview of delegates in Visual Basic.
Handling and Raising Events: Provides an overview of the event model in the .NET Framework.
Creating Event Handlers in Windows Forms: Describes how to work with events associated with Windows Forms objects.

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