AJAX Control Toolkit自动完成扩展程序无法正常工作

Question

aspx代码

 <asp:TextBox ID="TextBox1" 
  placeholder="Search By Title,Area,Tech,Type,Project Category,Date&year"
  runat="server"  Height="40px" Width="719px"></asp:TextBox>

<asp:AutoCompleteExtender ID="AutoCompleteExtender1>
    Enabled="true" DelimiterCharacters=""
    EnableCaching="false" FirstRowSelected="true"
    MinimumPrefixLength="1" TargetControlID="TextBox1" 
    runat="server"  ServiceMethod="GetCompletionList" 
    UseContextKey="True">
</asp:AutoCompleteExtender>