namespace WEB.Controllers
{
    public class BaseController : Controller
    {


        private BusinessLayer.User.User _currentUser;
        public BusinessLayer.User.User CurrentUser
        {
            get
            {
                if (!Request.IsAuthenticated) return null;

                if (_currentUser != null) return _currentUser;

                //try to get it form Session first, if its not there -> create it and put in the session
                if (Session["CurrentUser"] == null)
                {
                    _currentUser = new UserManager().UserDetailed(User.Identity.Name);
                    
                    Session["CurrentUser"] = _currentUser;
                    return _currentUser;
                }
                else //set it to the local var for the multiple references in the calling code and return
                {
                    _currentUser = (BusinessLayer.User.User)Session["CurrentUser"];
                    return _currentUser;
                }
            }

            set
            {
                _currentUser = value;
                Session["CurrentUser"] = _currentUser;
            }
        }



    }
}

protected void Application_Error(object sender, EventArgs e)
        {
            BusinessLayer.Extensions.Mailer mailerManager = new BusinessLayer.Extensions.Mailer();

            HttpContext ctx = HttpContext.Current;
            Exception ex = ctx.Server.GetLastError();
            ctx.Response.Clear();

            RequestContext rc = ((MvcHandler)ctx.CurrentHandler).RequestContext;
            IController controller = new  WEB.Controllers.BaseController();  // Тут можно использовать любой контроллер, например тот что используется в качестве базового типа
            var context = new ControllerContext(rc, (ControllerBase)controller);

            var viewResult = new ViewResult();

            var httpException = ex as HttpException;
            if (httpException != null)
            {

               


                switch (httpException.GetHttpCode())
                {


                    case 404:
......

...

namespace WEB.Controllers
{

    
    public class EventsController : BaseController
    {


 public ActionResult UserStream()
        {
            if (User.Identity.IsAuthenticated)
            {
                BusinessLayer.User.UserManager UM = new BusinessLayer.User.UserManager();
                ViewBag.EventsMain = UM.UserStream(CurrentUser.Id, 20);
                return View("UserStream");
            }            
            else { return View("UserStreamNA"); }            
        }
......

  //try to get it form Session first, if its not there -> create it and put in the session
                if (Session["CurrentUser"] == null)
                {
                    _currentUser = new UserManager().UserDetailedByName(User.Identity.Name);
                    
                    Session["CurrentUser"] = _currentUser;
                    return _currentUser;
                }