private void StopUnion()
        {
            Console.WriteLine("Interrupting Union Thread");
            Uth.Interrupt();

            Console.WriteLine("Waiting until Union thread stops");
            Uth.Join();

            this.BackColor             = defaultColor;
            stopUnionButton.Enabled    = false;
            executeUnionButton.Enabled = true;
        }
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (Uth.IsAlive)
            {
                Console.WriteLine("Interrupt  for Form Close");
                Uth.Interrupt();

                Console.WriteLine("Waiting until thread stops  for Form Close");
                Uth.Join();
            }

            if (Mth.IsAlive)
            {
                Console.WriteLine("Interrupt  for Form Close");
                Mth.Interrupt();

                Console.WriteLine("Waiting until thread stops  for Form Close");
                Mth.Join();
            }
        }