2.4

using System;

namespace ConsoleApp27
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Введите 2 числа: ");
            string aInput = Console.ReadLine();
            string bInput = Console.ReadLine();
            string cInput;
            int a, b, c;

            if (int.TryParse(aInput, out a) && int.TryParse(bInput,out b))
            {
                MinMax(ref a, ref b);
                Console.WriteLine($"{a} {b}");
            }
            else
            {
                Console.WriteLine("Ошибка ввода!");
            }

            Console.WriteLine("Введите 3 числа: ");
            aInput = Console.ReadLine();
            bInput = Console.ReadLine();
            cInput = Console.ReadLine();

            if (int.TryParse(aInput, out a)
                && int.TryParse(bInput, out b)
                && int.TryParse(cInput, out c))
            {
                MinMax(ref a, ref b, ref c);
                Console.WriteLine($"{a} {b} {c}");
            }
        }

        private static void MinMax(ref int a, ref int b)
        {
            int temp = 0;

            if (a < b)
            {
                temp = a;
                a = b;
                b = temp;
            }
        }

        private static void MinMax(ref int a, ref int b, ref int c)
        {
            int temp = 0;

            if (a < b)
            {
                temp = a;
                a = b;
                b = temp;
            }

            if (a < c)
            {
                temp = a;
                a = c;
                c = temp;
            }

            if (b < c)
            {
                temp = c;
                c = b;
                b = temp;
            }
        }
    }
}