Serialize c# object to JSON datastring

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Hi,

I am working with wcf webservice with json format string. my code is

[ServiceContract(Name = "StudentInformation")]
public interface IService1
{

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

string GetStudentDetails(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 = "StudentInfo")]
public class StudentList
{

[DataMember(Order = 1, Name = "StudentId")]
private string idStudent;
public string P_idstudent
{
get
{
return idStudent;
}
set
{
idStudent = value;
}
}

[DataMember(Order = 2, Name = "Student Type")]
private string StudentType;
public string P_Studenttype
{
get
{
return StudentType;
}
set
{
StudentType = value;
}
}

}


public class Service1 : IService1
{
public string GetStudentDetails(string Userid, string Password, string EntityId, string RequestAction, string RequestFilter)
{
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DbConnection"].ToString());

List<studentlist> lStudentList = new List<studentlist>();
string sql = "select * from student";
SqlCommand command = new SqlCommand(sql, conn);
SqlDataAdapter da = new SqlDataAdapter(command);
DataTable dt = new DataTable();
da.Fill(dt);
StudentList SList = new StudentList();
for (int i = 0; i < dt.Rows.Count; i++)
{

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

}
DataContractJsonSerializer serializer = new DataContractJsonSerializer(lStudentList.GetType());
MemoryStream memoryStream = new MemoryStream();
serializer.WriteObject(memoryStream, lStudentList);

string json = Encoding.Default.GetString(memoryStream.ToArray());
return json;

}
}


I am getting the json formatted result.

[{"StudentId":"2","Student Type":"1"},{"StudentId":"2","Student Type":"1"}]



but I need the results like

{“studentInfo” : [{"StudentId":"2","Student Type":"1"},{"StudentId":"2","Student Type":"1"}]}

what can i do to get the output concated “studentInfo” :