public static string StringToJSONString(string sValue)
{
System.Runtime.Serialization.Json.DataContractJsonSerializer serializer = new System.Runtime.Serialization.Json.DataContractJsonSerializer(sValue.GetType());
MemoryStream ms = new MemoryStream();
serializer.WriteObject(ms, sValue);
string json = Encoding.Default.GetString(ms.ToArray());
return json;
}