static void Main(string[] args) { CalcDlg dlobj1 = new CalcDlg(Add); CalcDlg dlobj2 = new CalcDlg(Subtract); CalcDlg dlobj3 = new CalcDlg(Product); CalcDlg dlobj4 = new CalcDlg(Divide); CalcDlg dlobj5 = dlobj1 + dlobj2 + dlobj3 + dlobj4; dlobj5(10, 5); Console.ReadLine(); }