static void Main(string[] args) { StockController controller = new StockController(); TimeSpan workDay = new TimeSpan(0, 0, 2); Task t1 = Task.Run(() => new SalesPerson("Pratik").Work(controller, workDay)); Task t2 = Task.Run(() => new SalesPerson("Varun").Work(controller, workDay)); Task t3 = Task.Run(() => new SalesPerson("Pradeep").Work(controller, workDay)); Task t4 = Task.Run(() => new SalesPerson("Himanshu").Work(controller, workDay)); Task.WaitAll(t1, t2, t3, t4); controller.DisplayStatus(); Console.ReadLine(); }