HttpHandler: Basics Types

To create a Synchronous HttpHandler, create a class that implements the IhttpHandler interface
For Asynchronous, implement IhttpAsyncHandler, BeginProcessRequest and EndProcessRequest
Custom file extensions must be registered with IIS and ASP.net
Extension ashx is already registered with IIS and ASP.net
Asynch Http handlers allows to start an external process and then continue the process of handler without waiting for the external process to finish