mvc filters

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace TestMvc.Controllers
{
    public class HomeController : Controller
    {
        [CustomFilter]
        [ResultFilter]
        public ActionResult Index()
        {
            ViewBag.Title = "Home Page";
            //throw new Exception("");
            return View();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web.Mvc;

namespace TestMvc
{
    public class CustomFilter : ActionFilterAttribute
    {
        public override void OnActionExecuted(ActionExecutedContext filterContext)
        {
            base.OnActionExecuted(filterContext);
        }

        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            base.OnActionExecuting(filterContext);
        }
    }

    public class ExFilter : IExceptionFilter
    {
        public void OnException(ExceptionContext filterContext)
        {
           // throw new NotImplementedException();
        }
    }

    public class ResultFilter : ActionFilterAttribute,IResultFilter
    {
        public override void OnResultExecuted(ResultExecutedContext filterContext)
        {
            throw new NotImplementedException();
        }

        public override void OnResultExecuting(ResultExecutingContext filterContext)
        {
            throw new NotImplementedException();
        }
    }
}

using System.Web;
using System.Web.Mvc;

namespace TestMvc
{
    public class FilterConfig
    {
        public static void RegisterGlobalFilters(GlobalFilterCollection filters)
        {
            filters.Add(new ExFilter());
            filters.Add(new HandleErrorAttribute());
        }
    }
}