rotate matrix on angel 90

gistfile1.txt

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
    class Program
    {
        // Input:
        // 1 2 3
        // 4 5 6
        // 7 8 9
        // Output:
        // 7 4 1
        // 8 5 2
        // 9 6 3
        static void Rotete90(string[,] mas, int count)
        {
            var x = count - 1;
            for (var i = 0; i < count; i++)
            {
                for (var j = 0; j < count; j++)
                {
                    var a = mas[j, x - i];
                    mas[j, x - i] = mas[i, j];
                    mas[i, j] = a;
                }
            }
        }

        static void cw(string[,] mas, int count)
        {
            for (var i = 0; i < count; i++)
            {
                for (var j = 0; j < count; j++)
                {
                    Console.Write(mas[i, j] + "    ");
                }
                Console.WriteLine("");
            }
        }

        static void Main(string[] args)
        {
            var mas = new string[5, 5];
            for (var i = 0; i < 5; i++)
            {
                for (var j = 0; j < 5; j++)
                {
                    mas[i, j] = "i" + i + " j" + j;
                }
            }

            cw(mas, 5);
            Console.WriteLine();

            Rotete90(mas, 5);
            cw(mas, 5);

            Console.ReadLine();
        }
    }
}