Send Data over JSON in WCF Service

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C#

WCF

JSON

Hi everyone I need to send large data from WFC to consumer(in my application i am using windows phone smart device) through JSON.

the code i am using is,

[ServiceContract]
   public interface ISampleService
   {
       [OperationContract]
       [WebInvoke(Method = "POST", ResponseFormat = WebMessageFormat.Xml, BodyStyle = WebMessageBodyStyle.WrappedRequest, UriTemplate = "GetEmployeeData/{userName}")]
       DataSet GetEmployeeData(string userName);

    }

public DataSet GetEmployeeData(string userName)
       {

           DataSet ds = dbServices.GetEmployeeData(userName);
           if (ds.Tables[0].Rows.Count > 0)
           {
               return ds;
           }
           else
           return null;
       }

and i receive the data in consumer(windows smart device app) as

HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(url + "GetEmployeeData" + "/" + "manikandan");
                webrequest.Method = "POST";
                webrequest.ContentType = "application/xml";
                webrequest.ContentLength = 0;
                Stream stream = webrequest.GetRequestStream();
                stream.Close();
                string result;
                using (WebResponse response = webrequest.GetResponse())
                {
                    using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                    {
                        result = reader.ReadToEnd();
                    }
                }
                DataSet ds = new DataSet();
                XmlElement exelement;
                XmlDocument doc = new XmlDocument();
                doc.LoadXml(result);
                exelement = doc.DocumentElement;
                 if (exelement != null)
                 {  
                     XmlNodeReader nodereader = new XmlNodeReader(exelement);
                     ds.ReadXml(nodereader, XmlReadMode.Auto);
                 }
                 lblCount.Text = ds.Tables[0].Rows.Count.ToString();
                 lblds.Text = ds.Tables[0].Rows[0][1].ToString();
                 dataGrid1.DataSource = ds;

when i did all the above the datagrid in the windows mobile is not loaded with the data.
I checked the dataset, by

string val = ds.Tables[0].Rows[0][1].ToString();

it receives the data. now can anybody tell me how to bind my ds to the datagrid in windows smartdevice mobile application.
Thanks in advance.