C# MVC 모드 404 500 페이지 설정 방법

<customErrors mode="On" defaultRedirect="Controllers/Action">
     <error statusCode="403" redirect="Controllers/Action" />
     <error statusCode="404" redirect="Controllers/Action" />
</customErrors>
 Controllers  Action

protected void Application_EndRequest()
{
        var statusCode = Context.Response.StatusCode;
        var routingData = Context.Request.RequestContext.RouteData;
        if (statusCode == 404 || statusCode == 500)
        {
           Response.Clear();
           var area = DataHelper.ConvertTo(routingData.DataTokens["area"], string.Empty);
           if (area == "Admin")
           {
                Response.RedirectToRoute("Admin_Default", new { controller = "BackError", action = "NotFound", IsReload = 1 });
           }
           else
           {
                Response.RedirectToRoute("Default", new { controller = "Error", action = "NotFound", id = UrlParameter.Optional });
           }

       }
}

Global.aspx.cs

public static void RegisterGlobalFilters(GlobalFilterCollection filters)  
{  
    filters.Add(new CustomHandlerErrorAttribute());  
}  

public class CustomHandlerErrorAttribute : HandleErrorAttribute  
{  
    public override void OnException(ExceptionContext filterContext)  
    {  
        if (filterContext.ExceptionHandled)  
        {  
            return;  
        }  
  
        filterContext.Controller.ViewData.Model = filterContext.Exception;  
  
        filterContext.Result = new ViewResult   
        {   
            ViewName = "Error",   
            ViewData = filterContext.Controller.ViewData   
        };  
  
        filterContext.ExceptionHandled = true;  
    }  
}  

<customErrors mode="On">  
  <error redirect="/home/error" statusCode="404" />  
</customErrors>  

<httpErrors errorMode="Custom" existingResponse="PassThrough">  
</httpErrors>  

<div class="box">  
    @{  
        
        var exception = ViewData.Model;  
        var statusCode = exception == null ? 404 : 500;  
        Response.StatusCode = statusCode;  
        if (statusCode == 404)  
        {  
            <h3>404 Page not found!</h3>  
            <p> !</p>  
        }  
        else if (statusCode == 500)  
        {  
            <h3>500  </h3>  
            <p>@exception.Message</p>  
        }  
    }  
    <p style="font-size: 12px; color: Gray"> ！</p>  
</div>