public async Task<ActionResult> Edit(EditModel model)
        {
            if (string.IsNullOrEmpty(model.UserName))
            {
                ModelState.AddModelError("UserName", "Name can't be empty!");
            }

            if (ModelState.IsValid)
            {
                ApplicationUser user = await UserManager.FindByNameAsync(User.Identity.Name);
                if (user != null)
                {
                    user.Email = model.Email;
                    user.UserName = model.UserName;
                    IdentityResult result = await UserManager.UpdateAsync(user);
                    if (result.Succeeded)
                    {
                        AuthenticationManager.SignOut();
                        return RedirectToAction("Login", "Account");
                    }
                    else
                    {
                        ModelState.AddModelError("", "Ooops! Something is wrong. Please, try again.");
                    }
                }
                else
                {
                    ModelState.AddModelError("", "Specified user is not found.");
                }
                return View(model);
            }
            return View(model);
        }
 public async Task<ActionResult> Edit()
 {
     ApplicationUser user = await UserManager.FindByNameAsync(User.Identity.Name);
     if (user != null)
     {
         EditModel model = new EditModel { UserName = user.UserName, Email = user.Email };
         return View(model);
     }
     return RedirectToAction("Login", "Account");
 }