public async Task<ActionResult> ExternalLoginConfirmation(
            ExternalLoginConfirmationViewModel model,
            string returnUrl)
        {
            if (this.User.Identity.IsAuthenticated)
            {
                return this.RedirectToAction("Index", "Manage");
            }

            if (this.ModelState.IsValid)
            {
                // Get the information about the user from the external login provider
                var info = await this.AuthenticationManager.GetExternalLoginInfoAsync();
                if (info == null)
                {
                    return this.View("ExternalLoginFailure");
                }

                var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
                var result = await this.UserManager.CreateAsync(user);
                if (result.Succeeded)
                {
                    result = await this.UserManager.AddLoginAsync(user.Id, info.Login);
                    if (result.Succeeded)
                    {
                        await this.SignInManager.SignInAsync(user, isPersistent: false, rememberBrowser: false);
                        return this.RedirectToLocal(returnUrl);
                    }
                }

                this.AddErrors(result);
            }

            this.ViewBag.ReturnUrl = returnUrl;
            return this.View(model);
        }
        public async Task<ActionResult> Register(RegisterViewModel model)
        {
            if (this.ModelState.IsValid)
            {
                var user = new ApplicationUser { UserName = model.Username, Email = model.Email };
                var result = await this.UserManager.CreateAsync(user, model.Password);
                if (result.Succeeded)
                {
                    await this.SignInManager.SignInAsync(user, isPersistent: false, rememberBrowser: false);

                    // For more information on how to enable account confirmation and password reset please visit http://go.microsoft.com/fwlink/?LinkID=320771
                    // Send an email with this link
                    // string code = await UserManager.GenerateEmailConfirmationTokenAsync(user.Id);
                    // var callbackUrl = Url.Action("ConfirmEmail", "Account", new { userId = user.Id, code = code }, protocol: Request.Url.Scheme);
                    // await UserManager.SendEmailAsync(user.Id, "Confirm your account", "Please confirm your account by clicking <a href=\"" + callbackUrl + "\">here</a>");
                    return this.RedirectToAction("Index", "Home");
                }

                this.AddErrors(result);
            }

            // If we got this far, something failed, redisplay form
            return this.View(model);
        }