System.Web namespace in .NET Framework Class Library
The System.Web namespace supplies classes and interfaces that enable browser-server communication. This namespace includes the HttpRequest class, which provides extensive information about the current HTTP request; the HttpResponse class, which manages HTTP output to the client; and the HttpServerUtility class, which provides access to server-side utilities and processes.
System.Web also includes classes for cookie manipulation, file transfer, exception information, and output cache control.