AutoSuggestBox is a free ASP.NET component, which allows you to implement functionality similar to 'Google Suggest' in any web application. This control is derived from asp:TextBox so you can use any validation available on Textbox. You can customize the look and feel through CSS. Complete source code and demos are available for download.
Download link is dead
Reviewed by: email@example.com on Thursday, February 19, 2009
Well, the idea looks great, code is easy and after spending a long time reading this and looking at my current code I find that it's no longer available.
Worth looking at
Reviewed by: AlexB1318 on Wednesday, January 21, 2009
AutoSuggestBox is definitely worth looking at. It provides a good google-like auto-suggest list of items. It's also much lighter than a dropdownlist of listbox since you're not pre-loading all of the data. I've used it for several years now, and I've been fairly satisfied with it, especially considering it's a FREE control. About the only thing I've been dissatisfied with is that there isn't in the way of forums for support so when you have a problem, it's hard to find help. Maybe that'll change if more people use it...