MVC: Return JSON result in action

There are two ways to return JSON-formatted content to caller:

1. MVC framework provides the JsonResult class to send JSON-formatted content to the caller. Suppose you have a C# object and you would like to return this C# object as JSON string to caller, you can use Json() method.

        [HttpPost]
        public JsonResult ValidateUser(string Password)
        {
            if (Password == ConfigurationManager.AppSettings["AccessPassword"])
                return Json(new { Valid = true });
            else
                return Json(new { Valid = false });
        }
2. If you have a valid JSON string at the backend and you would like to return it to front end, you can use ContentResult class to send JSON-formatted content to the caller.

        public ContentResult CalculateResults()
        {
            return new ContentResult { Content = @" { ""Year2014"": 100,  ""Year2015"": 200,  ""Year2016"": 300 }", ContentType = "application/json" };
        }