I have some DropDownList controls where the list is very large, so I would like to have a means for the user to filter the list, either based on other fields, e.g. region, or on the first letters typed in a textbox. How can I achieve this in ASP.NET? Is the an open source control out there that will help me?
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How about the Cascading Drop Down, or the List Search Extender within the Ajax Control Toolkit
http://www.asp.net/ajax/ajaxcontroltoolkit/Samples/CascadingDropDown/CascadingDropDown.aspx
http://www.asp.net/ajax/ajaxcontroltoolkit/Samples/ListSearch/ListSearch.aspx