public async Task Register(RegisterViewModel model)
        {
            if (ModelState.IsValid)
            {
                var user = new ApplicationUser { UserName = model.UserName, Email = model.Email };
                var result = await UserManager.CreateAsync(user, model.Password);

                if (result.Succeeded)
                {
                    await SignInManager.SignInAsync(user, isPersistent:false, rememberBrowser:false);

                    //Assign Role to User
                    await this.UserManager.AddToRoleAsync(user.Id, model.UserRoles);
                    return RedirectToAction("Index", "Home");
                }
                ViewBag.Name = new SelectList(context.Roles.Where(u => !u.Name.Contains("Admin"))
                    .ToList(), "Name", "Name");

                AddErrors(result);
            }

      // Register Student