public delegate void ASYNC(TMP_DATA Q);

class BORHS
{ ....
    static public void RE_CALL(TMP_DATA D)
        {
            switch (BORSH.CALL_TYPE)
            {
                case 1: new ASYNC                   ( INIT_THREAD).BeginInvoke(D, null, null); break;
                case 2: ThreadPool.QueueUserWorkItem( INIT_THREAD, D); ; break;
                case 3: new Thread                  ( INIT_THREAD).Start(D);break;
            }
        }
      public static void INIT_THREAD(object _Q)
        {
            TMP_DATA D = (TMP_DATA)_Q;
            MY_BUTTON MYB = (MY_BUTT)D.CONT;
            int K = 40;
            int SLEEP = D.TIME / K;

            for (int Q = 0; Q < K; Q++)
            {
                D.TXT = S + "(" + ((Q * 100)/K) + "%)";
                MYB.FORMA.Invoke(DEL1, D);
                Thread.Sleep(SLEEP);
            }
            //СИГНАЛ О ЗАВЕРШЕНИИ
            foreach (var T in MYB.NEXT_TASKs)   T.FINISHED();
       }
}

class MY_BUTTON 
{
 .....
 public void FINISHED()
        {
            lock (LOCK)
            {  INCOME++;
                if (INCOME==....)
                {
                        // ну тут запускаем новый процесс
                        TMP_DATA D = new TMP_DATA();
                        BORSH.RE_CALL(D);
                }
            }
        }
}