autocomplete in search textbox

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hi i am using jquery autocomplete it is working in aspx pages(without master page)
But when i wrote the code in child master page it is not working

$(document).ready(function () {
$(%=txtSearch.ClientID%>).autocomplete(SearchText.ashx);})

this my searchText.ashx code

public void ProcessRequest (HttpContext context) {

       string prefixText = context.Request.QueryString["q"];
       
       
           using (SqlConnection conn = new SqlConnection())
           {
               conn.ConnectionString = ConfigurationManager
                       .ConnectionStrings["constr"].ConnectionString;
               using (SqlCommand cmd = new SqlCommand())
               {
                   cmd.CommandText = "select Particulars from M_Stock where " +
                   "Particulars like @SearchText + '%'";
                   cmd.Parameters.AddWithValue("@SearchText", prefixText);
                   cmd.Connection = conn;
                   StringBuilder sb = new StringBuilder();
                   conn.Open();
                   using (SqlDataReader sdr = cmd.ExecuteReader())
                   {
                       while (sdr.Read())
                       {
                           sb.Append(sdr["Particulars"])
                               .Append(Environment.NewLine);
                       }
                   }
                   conn.Close();
                   context.Response.Write(sb.ToString());
               }

       }
   }

   public bool IsReusable {
       get {
           return false;
       }
   }