Метод Array.GetLength http://msdn.microsoft.com/ru-ru/library/system.array.getlength.aspx private static void FillMatrix(ref int[,] mas) { Random rand = new Random(); for (int i = 0; i < mas.GetLength(0); i++) { for (int j = 0; j < mas.GetLength(1); j++) { mas[i, j] = rand.Next(-100, 100); ...