Search engine friendly URLs using ASP.NET (C#.NET)

Here's an article which could be helpful for .NET developers: Search engine friendly URLs using ASP.NET (C#.NET).
Goal:
Instead of sending parameters like http://www.mydomain.com/?pageid=4 which is not search engine friendly, we want to change it to http://www.mydomain.com/page4.aspx

Similar thing is well known on Apache world and is called MOD_REWRITE. It could be interesting to compare these two technologies.