Hi all,
I have a MVC Ext.NET web project.
I do a base controller with the following code : 

 public class BaseController : Controller
    {
        protected override void OnException(ExceptionContext filterContext)
        { 
            base.OnException(filterContext);

            if (filterContext.Exception.GetType().Equals(typeof(ModPastiUserNotExistException)))
            {
                ViewBag.CurrentErrorMessage = filterContext.Exception.Message;
                filterContext.ExceptionHandled = true;
                ErrorModel errorInfo = new ErrorModel(filterContext.Exception, "ErrorController", "Index");
                errorInfo.Titolo = "Autenticazione";
                errorInfo.Messaggio = filterContext.Exception.Message ;

                filterContext.Result = View("error", errorInfo);
            }
            else
            {
                ViewBag.CurrentErrorMessage = filterContext.Exception.Message;
                filterContext.ExceptionHandled = true;
                ErrorModel errorInfo = new ErrorModel(filterContext.Exception, "ErrorController", "Index");
                errorInfo.Titolo = "Errore";
                errorInfo.Messaggio = filterContext.Exception.Message;

                filterContext.Result = View("error", errorInfo);
            }
        }        
    }
All the controllers of the app derive from base controller.
The Home Page has the following method :

  public ActionResult Index()
        {

            if (UserPermission.Instance.UserExist(HttpContext))
            {
                return View();
            }
            else
            {
                throw new ModPastiUserNotExistException();
            }
        }
I implemented both the error/index.cshtml and the ErrorController.cs and also the specialized exception.
Why the exception is not raised when in instanciate it?
Thanks in advance,
Simone