JsonSerializerSettings setting = new JsonSerializerSettings()
        {
            MissingMemberHandling = MissingMemberHandling.Ignore,
            NullValueHandling = NullValueHandling.Ignore            
        };
StreamReader reader = new StreamReader(Request.InputStream);
string data = reader.ReadToEnd();
RequestEntity requestEntity = JsonConvert.DeserializeObject<RequestEntity>(data, setting);