OpenIdReturnFromProvider.cs

public ActionResult OpenId()
{
    var response = openId.GetResponse();

    if (response == null)
    {
        return RedirectToAction("Index");
    }
    switch (response.Status)
    {
        case AuthenticationStatus.Authenticated:
            var fetch = response.GetExtension<FetchResponse>();
            string email;
            string fullName;
            string nickName;
            if (fetch != null)
            {
                email = fetch.GetAttributeValue(WellKnownAttributes.Contact.Email);
                fullName = fetch.GetAttributeValue(WellKnownAttributes.Name.FullName);
                if (string.IsNullOrEmpty(fullName))
                {
                    fullName = fetch.GetAttributeValue(WellKnownAttributes.Name.First) +
                               " " + fetch.GetAttributeValue(WellKnownAttributes.Name.Last);
                }
                nickName = fetch.GetAttributeValue(WellKnownAttributes.Name.Alias);
            }
            else
            {
                var claimsResponse = response.GetExtension<ClaimsResponse>();
                email = claimsResponse.Email;
                fullName = claimsResponse.FullName;
                nickName = claimsResponse.Nickname;
            }
            LoginUser(response.ClaimedIdentifier, response.FriendlyIdentifierForDisplay, email.Trim(), fullName.Trim(), nickName);
            return null;
        case AuthenticationStatus.Canceled:
            ModelState.AddModelError("loginIdentifier",
                "Login was cancelled at the provider");
            break;
        case AuthenticationStatus.Failed:
            ModelState.AddModelError("loginIdentifier",
                "Login failed using the provided OpenId identifier : " + response.Exception.Message);
            break;
    }

    return Login();
}