Rotate a matrix by 90 or 180 degrees

MatricsRotation.cs

using System;

namespace CsharpCodeExamples
{
    class Program
    {
        static void Main(string[] args)
        {
            var data = new int[,] { { 1, 1, 1, 1 },    
                                    { 2, 2, 2, 2 }, 
                                    { 3, 3, 3, 3 }, 
                                    { 4, 4, 4, 4 } };
            PrintArray(data);
            Console.WriteLine();

            var rotated180 = Rotate180(data);            
            PrintArray(rotated180);
            Console.WriteLine();

            var rotate90 = Rotate90(data);
            PrintArray(rotate90);

            Console.WriteLine();
        }

        /// <summary>
        /// Rotate matrics 90 degress clock wise.
        /// 
        /// The idea behind this is that the first row becomes the last column and the last 
        /// row becomes the first column
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public static int[,] Rotate90(int[,] data)
        {
            var data2 = new int[4, 4];

            int col = 0;
            int row = 0;
            for (int i = data.GetLength(0) - 1; i >= 0; i--)   // rows backwards
            {
                for (int n = 0; n < data.GetLength(1); n++)  // columns
                {
                    data2[row, col] = data[i, n];
                    row++;
                }
                col++;
                row = 0;
            }
            return data2;
        }

        /// <summary>
        /// Rotates the mattrics 180 degress
        /// 
        /// The idea behind this is a simple flip the last row becomes the first row. 
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public static int[,] Rotate180(int[,] data) {

            var data2 = new int[4, 4];
            int col = 0;
            int row = 0;
            for (int i = data.GetLength(0) - 1; i >= 0; i--)   // rows
            {
                for (int n = 0; n < data.GetLength(1); n++)  // columns
                {
                    data2[row, col] = data[i, n];
                    col++;
                }
                row++;
                col = 0;
            }

            return data2;
        }

        public static void PrintArray(int[,] data) {

            for (int i = 0; i < data.GetLength(0); i++)   // rows
            {
                for (int n = 0; n < data.GetLength(1); n++)  // columns
                {
                    var split = (n != data.GetLength(1) - 1) ? "," : string.Empty;
                    Console.Write(data[i,n] + split);
                }
                Console.WriteLine();
            }
        }
    }
}