Try using the auto complete with a web Method! adding up of the function
<WebMethod()>
Public Function blabla(ByVal prefixText As String, ByVal count As Integer) As List<String>
Dim country As String = ("India", "UK", "Indonesia", "Japan", "Sri Lanka", "Singapore")
Dim Qry = (From m In country Where m.ToString.StartsWith(prefixText, StringComparison.CurrentCultureIgnoreCase) Select m).Take(count)
Return Qry.ToList
End Function
I don't remember 100% Vb but it may work :) good luck and don't forget the
ServiceMethod="blabla"
ServicePath="MyPage.aspx"
in the Extender