ReadInt.cs

private static int ReadInt(int min = int.MinValue, int max = int.MaxValue)
{
    StringBuilder sb = new StringBuilder();
    do
    {
        ConsoleKeyInfo key = Console.ReadKey(true);

        if (char.IsNumber(key.KeyChar))
        {
            Console.Write(key.KeyChar);
            sb.Append(key.KeyChar);
        }
        else if (key.Key == ConsoleKey.Backspace && sb.Length > 0)
        {
            Console.Write("\b \b");
            sb.Length--;
        }
        else if (key.Key == ConsoleKey.Enter)
        {
            if (sb.Length > 0)
            {
                int num = int.Parse(sb.ToString());

                if (num >= min && num <= max)
                {
                    Console.WriteLine();
                    return num;
                }
                else
                {
                    int line = Console.CursorTop;
                    int col = Console.CursorLeft;

                    Console.SetCursorPosition(0, line + 1);
                    Console.WriteLine($"Input must be between {min} and {max} inclusive");

                    Console.SetCursorPosition(col, line);
                }

            }
        }
        else
        {
            Console.Beep();
        }
    } while (true);
}