/// <summary>
/// Log-in to Pastebin
/// </summary>
/// <returns>new User object</returns>
public static User Login(string username, string password)
{
var result = Utills.PostRequest(Utills.URL_LOGIN,
"api_dev_key=" + DevKey,
"api_user_name=" + username,
"api_user_password=" + password);
if (result.Contains(Utills.ERROR))
throw new PastebinException(result);
var user = new User(result);
user.RequestPreferences();
return user;
}