A wrapper class to return Json result back to the client.

public class JsonResultWrapper
    {
        public static JsonResultWrapper Create(bool success, string message)
        {
            return new JsonResultWrapper(success, message);
        }

        public static JsonResultWrapper Create(bool success, T data) where T : class
        {
            return new JsonResultWrapperImpl(success, string.Empty, data);
        }

        public static JsonResultWrapper Create(bool success, string message, T data) where T : class
        {
            return new JsonResultWrapperImpl(success, message, data);
        }

        protected JsonResultWrapper(bool success, string message)
        {
            this.Success = success;
            this.Message = message;
        }

        public bool Success { get; private set; }
        public string Message { get; private set; }
    }

    public class JsonResultWrapperImpl : JsonResultWrapper where T : class
    {
        public JsonResultWrapperImpl(bool success, string message, T data)
            : base(success, message)
        {
            this.Data = data;
        }

        public T Data { get; private set; }
    }  

    //How to use this wrapper class.
    public class SampleController : Controller
    {
     public JsonResult Save(Employee emp)
     {
        //Call the Model class to persist the information.
        var id = _employeeService.Save(emp);
        var status = id > 0;
        new Json(JsonResultWrapper.Create(status, "Employee information saved successfully", new SaveResult()
        {Id = id, IsValid = true};
     }
   }

Client code