How Can I Use Combobox With Dynamic Suggestive Behaviour In Asp Dot Net

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ASP

.NET

combobox

i used the follwoing but the code in .aspx file is not calling webmethod of .cs file
tell me why

here is sample of .aspx file that code is not calling .cs web method

<asp:TableCell>
<asp:TextBox ID="txtDishName" runat="server"/>
<ajaxToolkit:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server" TargetControlID="txtDishName"
MinimumPrefixLength="1" EnableCaching="true" CompletionSetCount="1" CompletionInterval="1000"
ServiceMethod="GetDishName" UseContextKey="True">





and this code in .cs file

[System.Web.Script.Services.ScriptMethod()]
[System.Web.Services.WebMethod]
protected List<string> GetDishName(string prefixText)
{
DataSet dsObj = objFunc.getDishName(prefixText);


List<string> dishNames = new List<string>();
for (int i = 0; i < dsObj.Tables[0].Rows.Count; i++)
{
dishNames.Add(dsObj.Tables[0].Rows[i][0].ToString());
}
return dishNames;
}