Let User Re-type The Input Without Interfering With Other Strings (C#)

Question

My input gets checked by "TryParse". And if it is false I want to let the user retype it correctly. But when I click any key after the check it deletes everything above cause of "Console.Clear();". - I want to delete only the input part and nothing above it.

namespace Practice
{
    class Program
    {
        static void Main(string[] args)     // Main Method
        {
            byte age1, age2;
            string input;

            do
            {
                Console.Write("Enter Age 1: "); input = Console.ReadLine();
                if (!byte.TryParse(input, out age1)) Error();
            } while (!byte.TryParse(input, out age1));

            do
            {
                Console.Write("Enter Age 2: "); input = Console.ReadLine();
                if (!byte.TryParse(input, out age1)) Error();
            } while (!byte.TryParse(input, out age2));
        }

        static void Error()
        {
            Console.ForegroundColor = ConsoleColor.Red;
            Console.Write("Invalid Input...");
            Console.ResetColor();
            Console.ReadKey();
            Console.Clear();
        }
    }
}

Answer 1

I'm not sure that you can erase a single line from the Console buffer. But you can simulate it if you change the second while in your code:

while (!byte.TryParse(input, out age2) && counter) { Error(); Console.WriteLine("Enter Age 1: {0}",age1); Console.Write("Enter Age 2: "); input = Console.ReadLine(); } // Check And Error Output

with this line Console.WriteLine("Enter Age 1: {0}",age1); after the Console.Clear(); executes, It seems like you have erased the wrong input line.