Multidimensional Arrays - 04. Matrix shuffling

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

namespace Advanced
{
    class Program
    {
        static void Main(string[] args)
        {
            var dimentions = Console.ReadLine()
                .Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
                .Select(int.Parse)
                .ToArray();

            int rows = dimentions[0];
            int cols = dimentions[1];

            var matrix = new string[rows, cols];

            for (int row = 0; row < rows; row++)
            {
                var currentRow = Console.ReadLine()
                .Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
                .ToArray();

                for (int col = 0; col < cols; col++)
                {
                    matrix[row, col] = currentRow[col];
                }
            }

            while (true)
            {
                var input = Console.ReadLine();

                if (input == "END")
                {
                    break;
                }

                var line = input.Split().ToArray();

                var command = line[0];

                if (command != "swap" || line.Length != 5)
                {
                    Console.WriteLine("Invalid input!");
                }

                else
                {
                    var row1 = int.Parse(line[1]);
                    var col1 = int.Parse(line[2]);
                    var row2 = int.Parse(line[3]);
                    var col2 = int.Parse(line[4]);

                    if (row1 < 0 || row1 >= rows
                        || col1 < 0 || col1 >= cols
                        || row2 < 0 || row2 >= rows
                        || col2 < 0 || col2 >= cols)
                    {
                        Console.WriteLine("Invalid input!");
                    }

                    else
                    {
                        var firstIndex = matrix[row1, col1];
                        var secondIndex = matrix[row2, col2];

                        matrix[row1, col1] = secondIndex;
                        matrix[row2, col2] = firstIndex;

                        for (int row = 0; row < rows; row++)
                        {
                            for (int col = 0; col < cols; col++)
                            {
                                Console.Write(matrix[row, col] + " ");
                            }
                            Console.WriteLine();
                        }
                    }
                }
            }
        }
    }
}