Working with URL Routing in ASP.NET Web Forms

While developing web sites, at times you require that the URLs being used are not mapped to any physical file. For example, you might be building a blog engine that stores all blog posts in a SQL Server database but while displaying these posts you want URLs to be SEO friendly. In such cases the resource pointed to by the URL has no physical existence. That's where the URL Routing features of ASP.NET come to the rescue. In addition to creating SEO friendly URLs these features also help you render easy to remember URLs. ASP.NET MVC relies heavily on the URL Routing feature. However, it is also possible to use URL Routing in web forms. In this tutorial you will learn just that.

http://www.bipinjoshi.net/articles/8a522617-6973-4dd5-97ce-82fb55ebdebc.aspx