In this article I would explain about HttpModules and HttpHandlers and how to use it on your Website. Sometimes, just creating dynamic Web pages with the latest languages and databases just does not give you , the developer enough control over an application. At times, you need to be able to dig deeper and create applications that can interact with the Web Server itself. You want to be able to interact with the low level processes such as how the Web Server processes incoming and outgoing HTTP requests. Before ASP.NET, in order to get this level of control using IIS, you were forced to create ISAPI extensions or filters. This proved to be quite daunting and painful task for many developers because creating ISAPI extensions and filters required knowledge of C/C++ and knowledge of how to create native Win32 DLLs. Thankfully, in .NET world, creating these types of low level applications is really no more difficult than most other tasks you would normally perform.