Autocomplete textbox is not working due to url rewrite in application

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.NET

Ajax

.NET4

C#5.0

WebMethod

in my application i m implement the url rewriting of page. i m using ajax autocomplete extender in my application but it is not working due to page rewrite.i m trying my best to solve the problem but it's not solved.below is my code

<asp:TextBox ID="txtCategoryName"  class="form-control" runat="server" 
                ontextchanged="txtCategoryName_TextChanged"></asp:TextBox>
             <cc1:AutoCompleteExtender ID="AutoCompleteExtender1"  runat="server"   TargetControlID="txtCategoryName" 
                                    MinimumPrefixLength="1" EnableCaching="true"  CompletionInterval="100" ServiceMethod="GetSuggessions"
                                    UseContextKey="true" CompletionSetCount="20">
                                </cc1:AutoCompleteExtender>

below is my webservice method which is created at page level

[WebMethod]
[System.Web.Script.Services.ScriptMethod]

   public static List<string> GetSuggessions(string prefixText, int count, string contextKey)
   {
       DataSet ds = null;

       BL.Category objCategory = new BL.Category();


       List<string> category = new List<string>();

       ds = objCategory.GetAllCategorySearch(prefixText);
       DataTable dt = ds.Tables[0];
       foreach (DataRow row in dt.Rows) // Loop over the rows.
       {
           string item = AjaxControlToolkit.AutoCompleteExtender.CreateAutoCompleteItem(row["CategoryName"].ToString(), row["CatId"].ToString());
           category.Add(item);
       }



       return category;


   }