Rows return in SP and in LINQ

Question

I try to call a stored procedure in LINQ.

web method which I try is

[WebMethod]
public static string search_data(DateTime fromdate, DateTime todate, string region)
{
    try
    {
        string result = "";

         TrackDataEntities1 td = new TrackDataEntities1();

                List<griddataresult_Result> dq = new
               List<griddataresult_Result>();
               dq = td.griddataresult(fromdate, todate, region).ToList();

        DataTable dt = new DataTable();

        dt.Columns.Add("ID", typeof(int));
        dt.Columns.Add("Owner", typeof(string));


        foreach (var c in dq)
        {
            dt.Rows.Add(c.ID, c.owner);
        }

        result = DataSetToJSON(dt);
        return result;
    }
    catch (Exception)
    {
        throw new Exception();
    }
 }

 public static string DataSetToJSON(DataTable dt)
 {
     Dictionary<string, object> dict = new Dictionary<string, object>();
     object[] arr = new object[dt.Rows.Count + 1];

     for (int i = 0; i <= dt.Rows.Count - 1; i++)
     {
         arr[i] = dt.Rows[i].ItemArray;
     }

     dict.Add("response", arr);

     JavaScriptSerializer json = new JavaScriptSerializer();
     return json.Serialize(dict);
}

 

check image

my sp return return 42 rows but when i run this code show me 577 row in table.. whereas there is not any error