[Authorize]
    [Route("confirm", Name = "ConfirmEmail")]
    public async Task<ActionResult> ConfirmEmail()
    {
        var user = await UserManager.FindByNameAsync(User.Identity.Name);

        if (user != null)
        {
            var provider = new DpapiDataProtectionProvider("InternetShop");
            UserManager.UserTokenProvider = new DataProtectorTokenProvider<ApplicationUser>(provider.Create("EmailConfirmation"));

            string token = await UserManager.GenerateEmailConfirmationTokenAsync(user.Id);
            string callBack = Url.RouteUrl("ConfirmEmail", new { userId = user.Id, token },
                protocol: Request.Url.Scheme);

            await UserManager.SendEmailAsync(user.Id, "Confirm email", $"For a registration competion" +
                 $"please folow the link: {callBack}");

            ViewBag.email = user.Email;

            return View("SendConfirmationCode");
        }
        else return View("Error");
    }

public class EmailService : IIdentityMessageService
    {
        public Task SendAsync(IdentityMessage message)
        {
            var from = ConfigurationManager.AppSettings["Email"];
            var pass = ConfigurationManager.AppSettings["Password"];

            SmtpClient client = new SmtpClient("smtp.yandex.ru", 25);

            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            client.UseDefaultCredentials = false;
            client.Credentials = new System.Net.NetworkCredential(from, pass);
            client.EnableSsl = true;

            var mail = new MailMessage(from, message.Destination);
            mail.Subject = message.Subject;
            mail.Body = message.Body;
            mail.IsBodyHtml = true;

            return client.SendMailAsync(mail);
        }
    }