MenuSys001

            int caseSwitch = 1;
            switch (caseSwitch)
            {
                case 1:
                    while(true)
                    {
                        Console.WriteLine("MENU 1 ##### 1 2 3");
                        string inp = Console.ReadLine();
                        if (inp.Length > 0) {
                            if (inp == "1") { goto case 1; }
                            if (inp == "2") { goto case 2; }
                            if (inp == "3") { goto case 3; }
                        }
                    }

                case 2:
                    while (true)
                    {
                        Console.WriteLine("MENU 2 ##### 1 2 3");
                        string inp = Console.ReadLine();
                        if (inp.Length > 0)
                        {
                            if (inp == "1") { goto case 1; }
                            if (inp == "2") { goto case 2; }
                            if (inp == "3") { goto case 3; }
                        }
                    }

                case 3:
                    while (true)
                    {
                        Console.WriteLine("MENU 3 ##### 1 2 3");
                        string inp = Console.ReadLine();
                        if (inp.Length > 0)
                        {
                            if (inp == "1") { goto case 1; }
                            if (inp == "2") { goto case 2; }
                            if (inp == "3") { goto case 3; }
                        }
                    }


            }