System.Threading.Tasks - Task.Factory.

   Task a1 = Task.Factory.StartNew(() => t1()).ContinueWith(y=> t3());

            Task a2 = Task.Factory.StartNew(() => t2());

 

        static   void t1()

        {

            Console.WriteLine("t1 -basla- ");

            for (int i = 0; i < 10; i++)

            {

                Thread.Sleep(1000);

                Console.WriteLine("t1 -" + i.ToString() + "-");

            }

            Console.WriteLine("t1 son");

        }

        static void t2()

        {

            Console.WriteLine("t2 -basla- ");

            for (int i = 0; i < 10; i++)

            {

                Thread.Sleep(1000);

                Console.WriteLine("t2 -" + i.ToString() + "-");

            }

            Console.WriteLine("t2 son");

        }

        static void t3()

        {

            Console.WriteLine("t3 -basla- ");

            for (int i = 0; i < 10; i++)

            {

                Thread.Sleep(1000);

                Console.WriteLine("t3 -" + i.ToString() + "-");

            }

            Console.WriteLine("t3 son");

        }