using System;

public class Program

{

            public static void Main(string[] args)

        {

            int[,] arr;

            Console.WriteLine("Enter lines");

            Console.WriteLine("Enter columns");

            arr = new int[int.Parse(Console.ReadLine()), int.Parse(Console.ReadLine())];

            for (int line = 0; line < arr.GetLength(0); line++)

            {

            for (int column = 0; column < arr.GetLength(1); column++)

            {

            Console.WriteLine("Enter number in " + line + column);

            arr[line, column] = int.Parse(Console.ReadLine());

            }

            }

            Print(arr);

            Print(Luahhakefel());

            Console.WriteLine("Enter lines and columns: ");

            int line1 = int.Parse(Console.ReadLine());

            int column1 = int.Parse(Console.ReadLine());

            Print(Random(line1, column1));

            Common(Random(line1, column1));

            Console.WriteLine("Enter square array line and column length: ");

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

            int[,] squarray = new int[num, num];

            for (int lines = 0; lines < squarray.GetLength(0); lines++)

            {

                for (int cols = 0; cols < squarray.GetLength(1); cols++)

                {

                    Console.WriteLine("Enter number in " + lines + cols);

                    squarray[lines, cols] = int.Parse(Console.ReadLine());

                }

            }

            Mainslant(squarray);

            Minorslant(squarray);

        }

        public static void Print(int[,] arr)

        {

            for (int line = 0; line < arr.GetLength(0); line++)

            {

                for (int col = 0; col < arr.GetLength(1); col++)

                {

                    Console.Write("{0} ", arr[line, col]);

                }

                Console.WriteLine();

            }

        }

        public static int[,] Luahhakefel()

        {

            int[,] arr;

            int a = 1;

            arr = new int[10, 10];

            for (int line = 0; line < arr.GetLength(0); line++)

            {

                for (int col = 0; col < arr.GetLength(1); col++)

                {

                    arr[line, col] = a;

                    a++;

                }

            }

            return arr;

        }

        public static int[,] Random(int lines, int cols)

        {

            Random rnd = new Random();

            int[,] arr = new int[lines, cols];

            for (int line = 0; line < arr.GetLength(0); line++)

            {

                for (int col = 0; col < arr.GetLength(1); col++)

                {

                    arr[line, col] = rnd.Next(1, 101);

                }

            }

            return arr;

        }

        public static void Common(int[,] arr)

        {

            int[] array = new int[100];

            int common;

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

            {

                for (int line = 0; line < arr.GetLength(0); line++)

                {

                    for (int col = 0; col < arr.GetLength(1); col++)

                    {

                        array[arr[line, col] - 1]++;

                    }

                }

            }

            common = array[0];

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

            {

                if (array[i] > common)

                    common = i+1;

            }

            Console.WriteLine("Most common number was: {0}", common);

        }

        public static void Mainslant(int[,] arr)

        {

            int sum = 0;

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

                sum = sum + arr[i, i];

            Console.WriteLine("Main slant sum is: {0}", sum);

        }

        public static void Minorslant(int[,] arr)

        {

            int sum = 0;

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

                sum += arr[i, arr.GetLength(0) - 1 - i];

            Console.WriteLine("Minor slant sum is: {0}", sum);

        }

    }

​