.NET uses ASP.NET 2.0 for building web applications. In ASP.NET development, the C# programmer’s job is to write the event handlers that respond to the user. Many of these events involve interaction with data.

As with Windows Forms, Visual Studio 2005 provides a visual design area where you can drag and drop controls onto the form surface.

The C# code for ASP.NET Web Forms runs on the server, not on the client. The server typically delivers only HTML to the browser.

Web Forms separate the visual part of the program from the logic. The interface is stored in a file with an .aspx extension. The logic, also called the code-behind file, is stored in a .cs file.

Like Windows Forms, Web Forms are event-driven and use the same system of delegates and events as Windows Forms do.

A postback event is one that causes the form to be sent to the server where event-handling code is run, and then the page is recreated and returned to the browser.

A non-postback event is one that does not force a postback. Non-postback events are handled when the next postback event is fired.

View state encodes the value of each control during the round trip to the server, so that the page delivered back to the browser retains these values.

Session state is used to maintain values across pages during a user’s session.

ASP.NET provides a set of data-bound controls that enable the controls to respond automatically as the data is changed.