Application pools in IIS (internet information service) can run in one of two modes
Web server will process the request based on the selected mode. if you selected integrated mode , then iis will use the new request processing pipelines of iis and asp.net. if you selected classic mode then server will route request processing pipelines of iis 6.0 through aspnet_isapi.
Thanks & Regards G.Renganathan Nothing is mine ,Everything is yours!!!