Hi Ana, Whatever u wish to achieve, u can get it completely with AJAX AutoCompleteExtender control, follow the link for example
http://www.c-sharpcorner.com/UploadFile/munnamax/AutocompleteExtender08062007113854AM/AutocompleteExtender.aspx http://www.asp.net/AJAX/AjaxControlToolkit/Samples/AutoComplete/AutoComplete.aspx And solution to ur error: set EnableEventValidation="false" in the Page directive. Regards Bixam. On Mon, Aug 10, 2009 at 9:15 PM, Ana <[email protected]> wrote: > > Hi, > > I'm new using ASP.NET/AJAX, so I'm having some difficulties developing > my page. In this page, I have to have a DropDownList where the user > can select multiple items (besides each item there will be a > CheckBox). The difficult part for me, is that this DropDownList is > populated based on what the user types on a TextBox. For example, > supose the DropDownList will be populate with countries. If the user > types A, the DDL will have all the countries starting with A. When he > keeps typing and add and F, for example (now we will have AF), only > the countries starting with AF will be in the list. And so on. > I know I need to use AJAX to do this, but because I never used AJAX > before, I don't know how to start. Can you please help me with this? > I'm using VB.NET, ASP.NET 3.5 and Visual Studio 2008. > > I really appreciate your help! > > Ana >
