ASP.NET 4 Unleashed

Processing Postback Data and Events

The ASP.NET Framework is built around web forms and controls pass information from the browser to the server by submitting a form to the server. This process of posting a form back to the server is called a postback.

When an ASP.NET page processes a form that has been posted back to the server, two types of information can be passed to the controls in the page. First, if a control initiates a postback, a server-side event can be raised when the form is posted to the server. For example, if you click a Button control, a Click event is raised on the server when the form containing the Button is posted back to the server. This event is called a postback event.

Second, the form data contained in the web form ...