OpenIdRelyingPartyInitialization.cs

private static OpenIdRelyingParty openId = new OpenIdRelyingParty();

[HttpPost]
public ActionResult OpenId(string identifier)
{
    if (!Identifier.IsValid(identifier))
    {
        ModelState.AddModelError("loginIdentifier",
                    "The specified login identifier is invalid");
        return RedirectToAction("Index");
    }
    //// use these to validate the connection to the OpenId provider
    //var r = (HttpWebRequest)WebRequest.Create(identifier);
    //var httpRes = (HttpWebResponse)r.GetResponse();

    var openIdIdentifier = Identifier.Parse(identifier);

    var request = openId.CreateRequest(openIdIdentifier);

    // Require some additional data
    var claimsRequest = new ClaimsRequest { Email = DemandLevel.Require };
    request.Mode = AuthenticationRequestMode.Setup;
    request.AddExtension(claimsRequest);

    return request.RedirectingResponse.AsActionResult();
}