namespace System
{
    public sealed class AppDomain : MarshalByRefObject
    {
        [Obsolete("AppDomain.GetCurrentThreadId has been deprecated because it does not provide a stable Id when managed threads are running on fibers (aka lightweight threads). To get a stable identifier for a managed thread, use the ManagedThreadId property on Thread.  https://go.microsoft.com/fwlink/?linkid=14202", false)]
        public static int GetCurrentThreadId();
    }
}