Wcf web service Json

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C#

Hi,
I am working with wcf webservice which returns Json formatted output string. my output string is

[{"RecordTotal":{"_RecordCount":"1"},"StudentInfo":{"idStudent":"2","Associated_entity":"1","StudentType":"1"}}]

But i want the output like

{"RecordTotal":[{"_RecordCount":"1"}],
"StudentInfo":[{"idStudent":"2","Associated_entity":"1","StudentType":"1"}]}

The root node and the brackets should be in the above format. what shall i do?

My code is

[ServiceContract]
 public interface IService1
 {

     [OperationContract]

     [WebInvoke(Method = "POST", UriTemplate = "/GetStudentDetailsCheck", RequestFormat = WebMessageFormat.Json,
     ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped)]
     string GetStudentDetailsCheck(string Userid, string Password, string EntityId, string RequestAction, string RequestFilter);
 }


 // Use a data contract as illustrated in the sample below to add composite types to service operations.
 [DataContract(Name = "RecordCount")]
 public class RecordCount
 {
     [DataMember(Order = 1)]
     private string _RecordCount = string.Empty;

     public string RCount { get { return _RecordCount; } set { _RecordCount = value; } }

 }
 [DataContract(Name = "StudentInfo")]
 public class StudentList
 {

     [DataMember(Order = 2)]
     private string idStudent;
     public string P_idstudent
     {
         get
         {
             return idStudent;
         }
         set
         {
             idStudent = value;
         }
     }
     [DataMember(Order = 3)]
     private string Associated_entity;
     public string P_Associated_entity
     {
         get
         {
             return Associated_entity;
         }
         set
         {
             Associated_entity = value;
         }
     }
     [DataMember(Order = 4)]
     private string StudentType;
     public string P_Studenttype
     {
         get
         {
             return StudentType;
         }
         set
         {
             StudentType = value;
         }
     }




 }

 public class Results
 {
     [DataMember(Order = 1)]
     private RecordCount objRecordList = null;
     public RecordCount RecordTotal { get { return objRecordList; } set { objRecordList = value; } }
     [DataMember(Order = 2)]
     private StudentList objStudentList = null;
     public StudentList StudentInfo { get { return objStudentList; } set { objStudentList = value; } }

 }

public string GetStudentDetailsCheck(string Userid, string Password, string EntityId, string RequestAction, string RequestFilter)
     {
         SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DbConnection"].ToString());

         List<StudentList> lStudentList = new List<StudentList>();
         List<RecordCount> lRecordCount = new List<RecordCount>();
         List<Results> lResultList = new List<Results>();
         string sql = "select S.*,Em.Org_id from student S inner join entity_master Em on S.associated_entity=Em.Identity_master and Em.org_id like '%" + RequestFilter + "%'";
         SqlCommand command = new SqlCommand(sql, conn);
         SqlDataAdapter da = new SqlDataAdapter(command);
         DataTable dt = new DataTable();
         da.Fill(dt);
         StudentList SList = new StudentList();
         RecordCount Rcounts = new RecordCount();
         Rcounts.RCount = (dt.Rows.Count - 1).ToString();
         lRecordCount.Add(Rcounts);
         string RequestFilters = RequestFilter;
         for (int i = 0; i < dt.Rows.Count; i++)
         {

             SList.P_idstudent = dt.Rows[i]["idstudent"].ToString();
             SList.P_Associated_entity = dt.Rows[i]["associated_entity"].ToString();
             SList.P_Studenttype = dt.Rows[i]["type"].ToString();

             lStudentList.Add(SList);

         }

         Results lstRes = new Results();
         lstRes.RecordTotal = Rcounts;
         lstRes.StudentInfo = SList;
         lResultList.Add(lstRes);

         System.Runtime.Serialization.Json.DataContractJsonSerializer serializer = new
         System.Runtime.Serialization.Json.DataContractJsonSerializer(lResultList.GetType());
         MemoryStream ms = new MemoryStream();
         serializer.WriteObject(ms, lResultList);
         string jsonString = Encoding.Default.GetString(ms.ToArray());
         ms.Close();
         return jsonString;
     }