I want to create a dropdownlist but user can type on it. Then I want to use typed-text to filter data that I already filled dropdownlist with. I want to design it as new control. How can I do?
You can also look at this.. http://www.asp.net/ajax/ajaxcontroltoolkit/samples/combobox/combobox.aspx
[Update the link above is dead so here is the latest one] https://ajaxcontroltoolkit.codeplex.com/wikipage?title=ComboBox%20Control
ASP does not have a Editable dropdownlist. There are many available on internet have a look at