public static FindFriendsWindow GetInstance(String accessToken)
{
if (FindFriendsWindow.instance == null)
{
lock (_syncRoot)
{
if (FindFriendsWindow.instance == null)
{
FindFriendsWindow.instance = new FindFriendsWindow(accessToken);
}
}
}
return FindFriendsWindow.instance;
}
private void Window_Closed(object sender, EventArgs e)
{
instance = null;
}