public static void Main()
        {
            ProcessBusinessLogic bl = new ProcessBusinessLogic();

            bl.ProcessCompleted += bl_ProcessCompleted; // register with an event
            bl.StartProcess();
        }
        static void Main(string[] args)
        {
            //Console.WriteLine("Hello World!");
            ProcessBusinessLogic bl = new ProcessBusinessLogic();

            bl.ProcessCompleted += bl_ProcessCompleted;
            bl.ProcessCompleted += bl1_ProcessCompleted;
            bl.ProcessCompleted += bl2_ProcessCompleted;
            bl.ProcessCompleted += bl3_ProcessCompleted;
            bl.ProcessCompleted += bl4_ProcessCompleted;


            bl.StartProcess();

            bl.ProcessCompleted -= bl4_ProcessCompleted;

            bl.StartProcess();

            Console.ReadKey();
        }