Programming ASP .NET

Page and Control Events

The page and controls all have a number of events that are derived from the Control class (or the TemplateControl class, in the case of the Error event). All pass an event argument of type EventArgs that exposes no properties. Some of these events are listed in Table 3-2.

Table 3-2. Some common page and control events

Event name	Description
DataBinding	Occurs when control binds to a data source
Disposed	Occurs when control is released from memory
Error	For the page only, occurs when an unhandled exception is thrown
Init	Occurs when the control is initialized
Load	Occurs when the control is loaded to the Page object
PreRender	Occurs when the control is about to be rendered
Unload	Occurs when the control is unloaded from memory

Tip

Binding a control to a data source means that the control and the data source are tied together so that the control knows to use that data source for populating itself. For a complete description of controls and data binding, see Chapter 9.