public async Task <ActionResult> Register(ApplicationUser user) { if (!ModelState.IsValid) { return(View(user)); } if (_context.ApplicationUsers.Any(u => u.Email == user.Email)) { ModelState.AddModelError("Email", "This email is duplicate"); return(View(user)); } if (_context.ApplicationUsers.Any(u => u.Username == user.Username)) { ModelState.AddModelError("Email", "This username is duplicate"); return(View(user)); } user.Password = user.ConfirmPassword = Crypto.HashPassword(user.Password); _context.ApplicationUsers.Add(user); await _context.SaveChangesAsync(); return(RedirectToAction(nameof(Login))); }