In this video we will learn about events at an asp.net server control. Server control events can be classified into 3 categories.
Postback events - These events submit the Web page, immediately to the server for processing. Click event of a button control is an example for Post Back event.
Cached events - These events are saved in the page's view state to be processed when a postback event occurs. TextChanged event of TextBox control, and SelectedIndexChanged event of a DropDownList control are examples of cached events. Cached events can be converted into post back events, by setting the AutoPostBack property of the control to true.
Validation events - These events occur on the client, before the page is posted back to the server. All validation controls use these type of events.