Entering char without pressing Enter button using C#

Console.Write ("gender (Enter F or M): ");
           
            ConsoleKeyInfo info = Console.ReadKey();
            char x =info.KeyChar;
            switch (x)
            {
                case 'F':
                case 'f':
                    Console.WriteLine();
                    Console.WriteLine("you entered {0}    ", x);
                    break;

                case 'M':
                case 'm':
                    Console.WriteLine();
                    Console.WriteLine("you entered {0}  ", x);
                    break;

                default:
                    Console.Write("please enter m  or f ");
                    break;