ASP.Net Autocomplete ปกติก็ทำงานได้ แต่ตอนนี้มันไม่ทำงานเลยอะ ลองdebugแล้ว

<asp:TextBox ID="txtname" runat="server" Width="650px" MaxLength="250" placeholder="ชื่อกระบวนการ" CssClass=tb7></asp:TextBox>
                    <asp:AutoCompleteExtender ID="TextBox1_AutoCompleteExtender" runat="server" 
                        DelimiterCharacters="" Enabled="True" ServiceMethod="Search"  
                        TargetControlID="txtname" UseContextKey="True" ServicePath="../WebService.asmx"
                        MinimumPrefixLength="1" CompletionListCssClass="AutoExtender" CompletionListItemCssClass="AutoExtenderList" 
                        CompletionListHighlightedItemCssClass="AutoExtenderHighlight" >
                    </asp:AutoCompleteExtender>

    [WebMethod]
    public string[] Search(string prefixText)
    {
        string sql = "SELECT Proc_Name FROM Process WHERE Proc_Name like @prefixText";

        SqlDataAdapter da = new SqlDataAdapter(sql, ConfigurationManager.ConnectionStrings["Audit_SystemConnectionString"].ConnectionString);

        da.SelectCommand.Parameters.Add("@prefixText", System.Data.SqlDbType.VarChar, 250).Value = "%" + prefixText + "%";

        DataTable dt = new DataTable();

        da.Fill(dt);

        string[] item = new string[dt.Rows.Count];
        int i = 0;

        foreach (DataRow dr in dt.Rows)
        {
            item.SetValue(dr["Proc_Name"].ToString(), i);
            i++;
            if (i == 5)
            {
                Array.Resize(ref item, 5);
                break;
            }

        }
        Array.Sort(item);
        //Array.Resize(ref item, 5);
            
        return item;
        
    }
    
}