Autocompleteextender not working

Question

Hi,

 

I am working with Ajax Autocompleteextender.

 

It is not displaying the names .

 

Below is the sample code.

 

.cs

[System.Web.Script.Services.ScriptMethod()]
[System.Web.Services.WebMethod]
public static List<string> Getfirstname(string prefixText)
{
string strFilter = string.Empty;
DataSet ds = new DataSet();
System.Data.DataTable dt = new System.Data.DataTable();
es_CustomersDAL ObjCustomersDAL = new es_CustomersDAL();
ds = ObjCustomersDAL.GetCustomers();
//ds = (DataSet)HttpContext.Current.Session["dsgroups"];
System.Data.DataView dv = ds.Tables[0].DefaultView;
strFilter += "ES_CustomerName LIKE '" + prefixText + "%'";
dv.RowFilter = strFilter;
dt = dv.ToTable();
List<string> GetCustomerName = new List<string>();
for (int i = 0; i < dv.Count; i++)
{
GetCustomerName.Add(dt.Rows[i]["ES_CustomerName"].ToString());
}
return GetCustomerName;
}

.aspx

<tr>
<td>
</td>
<td width="17%" >
First / Company Name
</td>
<td width="32%" >
<%--<asp:UpdatePanel ID="_udpCompanyName" runat="server">
<ContentTemplate>--%>
<asp:TextBox TabIndex="6" ID="txtfirstname" placeholder="Full Name of Comapany" runat="server" class="input ui-tooltip" MaxLength="110" title="Please enter slowely name."></asp:TextBox>
<asp:AutoCompleteExtender ID="auto1" runat="server" TargetControlID="txtfirstname" MinimumPrefixLength="1" EnableCaching="false" CompletionSetCount="1" CompletionInterval="100" ServiceMethod="Getfirstname"></asp:AutoCompleteExtender>
<%-- <asp:AutoCompleteExtender ID="AutoComptxtfirstname" runat="server" TargetControlID="txtfirstname" MinimumPrefixLength="1" EnableCaching="true" CompletionSetCount="1" CompletionInterval="100"
ServiceMethod="Getfirstname" >
</asp:AutoCompleteExtender>--%>
<span class="mandatoryfield">* </span><%--</ContentTemplate>
</asp:UpdatePanel>
--%>
</td>
<td width="13%" >
Last Name
</td>
<td width="38%" >
<asp:TextBox TabIndex="7" ID="txtlastname" runat="server" class="input" MaxLength="110"></asp:TextBox>
</td>
</tr>