using System;

​

     public class Program

    {

        public int[,] ReadArray(int width, int height)

        {

            int[,] array = new int[width, height];

            for (int i = 0; i < width; i++)

            {

                for (int j = 0; j < height; j++)

                {

                    while (true)

                    {

                        try

                        {

                            Console.Write("[{0}, {1}] = ", i, j);

                            array[i, j] = int.Parse(Console.ReadLine());

                            break;

                        }

                        catch

                        {

                            Console.WriteLine("You can insert only number!!!\n Please insert [{0}, {1}] = ", i, j);

                        }

                    }

                }

                Console.WriteLine();

            }

            return array;

        }

       public void SetWidthHeight(ref int width, ref int height)

        {

            while (true)

            {

                try

                {

                    Console.Write("Width = ");

                    width = int.Parse(Console.ReadLine());

                    break;

                }

                catch

                {

                    Console.WriteLine("You can insert only number!!!\n Width = ");

                }

            }

            while (true)

            {

                try

                {

                    Console.Write("Height = ");

                    height = int.Parse(Console.ReadLine());

                    break;

                }

                catch

                {

                    Console.WriteLine("You can insert only number!!!\n Height = ");

                }

            }

        }

        public int FindIndexMax(int[,] array)

        {

            int IndexMax = 0, max = array[0,0];

            for (int i = 0; i < array.GetLength(0); i++)

            {

                for (int j = 0; j < array.GetLength(1); j++)

                {

                    if (array[i, j] > max)

                    {

                        max = array[i, j];

                        IndexMax = i;

                    }

                }

            }

            Console.WriteLine("First amx vlue is in {0} row.", IndexMax - 1);

            return IndexMax;

        }

        public int[,] SwapRows(int[,] array, int mindex)

        {

            int temp;

            for (int i = 0; i < array.GetLength(1); i++)

            {

                temp = array[0, i];

                array[0, i] = array[mindex, i];

                array[mindex, i] = temp;

            }

            return array;

        }

        public void ShowArray(int[,] array)

        {

            Console.WriteLine();

             for (int i = 0; i < array.GetLength(0); i++)

            {

                for (int j = 0; j < array.GetLength(1); j++)

                {

                    Console.Write("{0}\t",array[i,j]);

                }

                Console.WriteLine();

            }

             Console.WriteLine();

        }

        public static void Main(string[] args)

        {

            Program pr = new Program();

            int width = 0, height = 0, maxind = 0;

            pr.SetWidthHeight(ref width, ref height);

            int[,] array = pr.ReadArray(width, height);

            pr.ShowArray(array);

            maxind = pr.FindIndexMax(array);

            int[,] newarray = pr.SwapRows(array, maxind);

            pr.ShowArray(newarray);

        }

    }

​