no data binding to my JQGrid using c# asp.net

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C#

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JQGrid

Hi implemented jquery grid using json and dictionaries.
I am getting error with Request.InputStream. i am always getting null value.
If i pass static inputs method "GetData" it showing empty grid.

   public class EmpDetails
   {
       public int id;
       public string[] cell;
   }
   public class JsonEmployeeData
   {
       public int page;
       public int total;
       public int records;
       public EmpDetails[] rows;
   }
    public partial class NewImpUsingJson : System.Web.UI.Page
   {
       protected void Page_Load(object sender, EventArgs e)
       {
            if (Request.QueryString["method"] == "GetData")
           {
               Request.InputStream.Position = 0;
               StreamReader ipStRdr = new StreamReader(Request.InputStream);
               string json = ipStRdr.ReadToEnd();
               JavaScriptSerializer jser = new JavaScriptSerializer();
Dictionary<string, string> dict = jser.Deserialize<Dictionary<string, string>>(json);
                    //NewImpUsingJson.GetData(1,10,1,"ASC");
               NewImpUsingJson.GetData(int.Parse(dict["page"].ToString()), int.Parse(dict["rows"].ToString()), int.Parse(dict["_search"].ToString()), dict["sord"].ToString());
               Response.End();
           }
                   }

       [WebMethod]
       [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
       public static JsonEmployeeData GetData(int page, int rows, int _search, string sord)
       {
          //int startindex = (page - 1) * pagesize;
           //int endindex = page * pagesize;
           string queryString = "SELECT Row_Number() over (order by EmployeeId ASC) as rowID, EmployeeId,EmployeeName,ContactNumber FROM (Select ROW_NUMBER() OVER (ORDER BY EmployeeId ASC) AS ROWID," +
           "EmployeeId,EmployeeName,ContactNumber FROM EmployeeJtable) AS a";                    SqlConnection connection = new SqlConnection(@"Data Source=HYD-NPULIVARTHY;Initial Catalog=test2;Integrated Security=True");
               connection.Open();
               DataTable dt = new DataTable();
               SqlDataAdapter adapter = new SqlDataAdapter(queryString, connection);
               var tRows = adapter.Fill(dt);
               JsonEmployeeData result = new JsonEmployeeData();
               List<EmpDetails> rowsadded = new List<EmpDetails>();
               int index=1;
               foreach (DataRow dtRow in dt.Rows)
               {
                   EmpDetails newrow = new EmpDetails();
                   newrow.id = index++;
                   newrow.cell = new string[3];
                   newrow.cell[0] = dtRow[1].ToString();
                   newrow.cell[1] = dtRow[2].ToString();
                   newrow.cell[2] = dtRow[3].ToString();
                   rowsadded.Add(newrow);
               }
               result.rows = rowsadded.ToArray();
               result.page = page;
               result.total = ((rowsadded.Count + rows - 1) / tRows);
               result.records = rowsadded.Count;
               return result;
       }
   }

and my script code is

<script type="text/javascript">
       $(document).ready(function () {
       var sPage="NewImpUsingJson.aspx"
      jQuery("#Grid1").jqGrid({
          url: sPage + '?method=GetData',
          datatype: 'json',
          mtype: 'GET',
          colNames: ['id','EmployeeId', 'EmployeeName', 'ContactNumber'],
          colModel: [
                   { name: 'id', index: 'id', width: 60, search: false },
                  { name: 'EmployeeId', index: 'EmployeeId', width: 90, align: 'center', sorttype: 'EmployeeId'},
                  { name: 'EmployeeName', index: 'EmployeeName', width: 105, align: 'right' },
                  { name: 'ContactNumber', index: 'ContactNumber', width: 95, align: 'left' }
                  ],
          pager: '#pager',
          sortname: 'EmployeeId',
          viewrecoreds: true,
           serializeGridData: function(data)
             {
             // return  $.toJSON(data);   /// done to override default serialization
                 return JSON.stringify(data);
             },
             jsonReader: { repeatitems: false, root: "rows", page: "page", total: "total", records: "records" }
         });
         jQuery("#Grid1").jqGrid('navGrid', '#Pager', { edit: false, add: false, del: false }, null, null, true, { multipleSearch: true });
         var height = $(window).height();
      });


  </script>

please any one help to implement displaying data in JQGrid using SQL Server 2008 data.