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                string auswahl;

                Console.Write("triff deine auswahl 1,2,a oder b: ");
                auswahl = Console.ReadLine();

                switch (auswahl)
                {
                    case (1):
                        Console.Write("1");
                        Console.Read();
                        break;
                    case (2):
                        Console.Write("2");
                        Console.Read();
                        break;
                    case (a):
                        Console.Write("a");
                        Console.Read();
                        break;
                    case (b):
                        Console.Write("b");
                        Console.Read();
                        break;