ActionName

public class HomeController : Controller
    {
        [HttpGet]
        public ActionResult Index()
        {
            ViewBag.Message = "Welcome to ASP.NET MVC!";

            return View();
        }

        [HttpPost]
        public ActionResult Index()
        {
            ViewBag.Message = "Welcome to ASP.NET MVC!";

            return View();
        }
    }

//Type 'xxx.Controllers.HomeController' already defines a member called 'Index' with the same parameter types