public void Login(string username, string password)
{
LoginFactory lf = new LoginFactory();
lf.Login(username, password, delegate(object sender, LoginCompleteEventArgs args)
{
_currentUser = args.User;
Deployment.Current.Dispatcher.BeginInvoke(() => OnLoginComplete(null, EventArgs.Empty));
});
}
public void Logout()
{
_currentUser = null;
}