ASP.NET AJAX AutoCompleteExtender 自動完成 預設選取第一筆

   <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
    </asp:ToolkitScriptManager>  //要先從工具箱拉出來

FirstRowSelected="True" //預設選取第一筆

<asp:TextBox ID="TextBox1" runat="server" Width="500px"></asp:TextBox>

<asp:AutoCompleteExtender ID="TextBox1_AutoCompleteExtender" runat="server"
  ServiceMethod="GetICD9"
  ServicePath="WebService.asmx"
  TargetControlID="TextBox1"
  MinimumPrefixLength="1"
  CompletionInterval="100"
  EnableCaching="true"
  CompletionSetCount="10"
  FirstRowSelected="True">
  </asp:AutoCompleteExtender>