In MVC, we have the JsonResult class by which we can return back data in JSON format. Below is a simple sample code which returns back a Customer object in JSON format using JsonResult.

public JsonResult getCustomer()
{
   Customer obj = new Customer();
   obj.CustomerCode = "1001";
   obj.CustomerName = "Shiv";
   return Json(obj,JsonRequestBehavior.AllowGet);
}