static void Main(string[] args)
        {
            Random random = new Random();

            int minNumber = 2;
            int maxNumber = 10;
            int countColumns = random.Next(minNumber, maxNumber);
            int countLines = random.Next(minNumber, maxNumber);
            int[,] array = new int[countLines, countColumns];
            int columnNumber = 1;
            int lineNumber = 2;
            int summLine = 0;
            int productColumn = 1;

            Console.WriteLine($"Матрица [{countLines},{countColumns}]:\n");

            for (int i = 0; i < array.GetLength(0); i++)
            {
                for (int j = 0; j < array.GetLength(1); j++)
                {
                    array[i, j] = random.Next(minNumber, maxNumber);

                    Console.Write(array[i, j] + " ");
                }

                Console.WriteLine();
            }

            for (int i = 0; i < array.GetLength(0); i++)
            {
                for (int j = 0; j < array.GetLength(1); j++)
                {
                    if (i == (lineNumber - 1))
                    {
                        summLine += array[lineNumber - 1, j];
                    }
                }
            }

            for (int i = 0; i < array.GetLength(0); i++)
            {
                productColumn *= array[i, columnNumber - 1];
            }

            Console.WriteLine($"\nСумма {lineNumber} строки = {summLine}\n" +
                $"Произведение {columnNumber} столбца = {productColumn}");
        }