public void Authenticate(Credentials credentials)
{
// We need to load the logon page first to get the session key
string html = GetLogonPage();
credentials.K1MagicString = ExtractAuthK1.ExtractFrom(html);
credentials.SessionKeyValue = webClient.GetCookieValue(SessionKeyName);
webClient.AddCookie("alba_an", credentials.Account, BasePath.ApplicationPath, BasePath.Site);
webClient.AddCookie("alba_us", credentials.User, BasePath.ApplicationPath, BasePath.Site);
webClient.AddCookie(SessionKeyName, credentials.SessionKeyValue, "/", BasePath.Site);
SubmitCredentials(credentials);
}