ajax control tool kit :-autocompleteextender

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C#

ASP.NET

I have a text box:

<div>    
  <asp:TextBox ID="TextBox1" runat="server" Height="19px" Width="249px">
  <asp:AutoCompleteExtender ID="TextBox1_AutoCompleteExtender" runat="server" 
            DelimiterCharacters="" Enabled="True" MinimumPrefixLength="1" ScriptPath="" 
            ServiceMethod="findName" ServicePath="WebService.asmx" 
            TargetControlID="TextBox1">        
  <br />
  <asp:ScriptManager ID="ScriptManager1" runat="server">
</div>

I have a WebService:

[WebMethod]

public string[] findName(string prefix)
{
    SqlConnection cn = new SqlConnection("uid=sa;pwd=tatwa;server=192.168.10.19;database=DAMBanking");
    cn.Open();
    string query = "select * from T_Advisor_Master where Advisor_Name like '" + prefix + "%'";
    SqlDataAdapter da = new SqlDataAdapter(query, cn);
    DataSet ds = new DataSet();
    ds.Clear();
    ds.Reset();
    da.Fill(ds);
    string[] item = new string[ds.Tables[0].Rows.Count];
    int i = 0;
    foreach (DataRow dr in ds.Tables[0].Rows)
    {
        item.SetValue(dr["Advisor_Name"].ToString(), i);
        i++;
    }
    return item;
}

But when I click on the textbox it is not fetching the data,
But when I run the WebService file the data is showing in xml format.
But I need it show when I click on textbox like a list.
I am using .net2010
It is working in .net2008 but not in 2010

Please help me!