Date: 05/25/06 (Asp Dot Net)    Keywords: asp, google

I created a Control that contains a textbox that does autocomplete similar to Google Suggest. It's written in C# for ASP.NET 2.0. It's free to use, open source and pretty well documented.
Get more information including download instructions, or check out a demo.

Source: http://community.livejournal.com/aspdotnet/67872.html