Hi Hassan,

As other members have suggested, you can have a look at the URL Rewriting and Url Routing feature of ASP.NET.

Also, with the new IIS 7 integrated pipeline model, URL Rewriting has been incorporated as a IIS 7 feature. Here are some further reference about IIS 7 Url Rewriting and its comparison with Url Routing

#Using the URL Rewrite Module
http://learn.iis.net/page.aspx/460/using-the-url-rewrite-module/

#IIS URL Rewriting and ASP.NET Routing
http://learn.iis.net/page.aspx/496/iis-url-rewriting-and-aspnet-routing/