Wait for the other threads to complete

class clsThreading
    {
        public static void Main(string[] args)
        {
            //Passing function "Display1to5" to ThreadStart Delegate
            ThreadStart thdstObj1 = new ThreadStart(Display1to5);
            //Passing function "Display5to10" to ThreadStart Delegate
            ThreadStart thdstObj2 = new ThreadStart(Display5to10);

            //Passed thdstObj1 delegate created above to the Thread Object.
            Thread thdFirstThread = new Thread(thdstObj1);
            //Passed thdstObj2 delegate created above to the Thread Object.
            Thread thdSecondThread = new Thread(thdstObj2);

            //Started First thread.
            thdFirstThread.Start();
            //Started Second thread.
            thdSecondThread.Start();

            //thdFirstThread thread waits till the completion of thdSecondThread thread.
            thdFirstThread.Join();
            Console.WriteLine("Exiting Main");
            Console.ReadLine();
        }
        public static void Display1to5()
        {
            for (int i = 1; i <= 5; i++)
            {
                Console.WriteLine("{0}", i);
            }
        }
        public static void Display5to10()
        {
            for (int i = 6; i <= 10; i++)
            {
                Console.WriteLine("{0}", i);
            }
        }
    }