c# object[,] to object[][], excel itd.

static void Main(string[] args)
        {
            int[,] tubo = new int[4, 8];
            for (int i = 0; i < tubo.GetLength(0); i++)
            {
                for (int j = 0; j < tubo.GetLength(1); j++)
                {
                    tubo[i, j] = i * 10 + j;
                }
            }

            var query = from i in GetByRow(tubo, 1)
                        select i;
            Console.WriteLine("Cells in row 1");
            foreach (int i in query)
                Console.Write(i + ", ");

            Console.WriteLine("\nAll Cells");
            var q2 = from r in GetRows(tubo)
                     from c in r
                     select c;
            foreach (int i in q2)
                Console.Write(i + ", ");

            Console.WriteLine("Rank " + tubo.Rank);
            Console.ReadLine();
        }

        static IEnumerable<IEnumerable<T>> GetRows<T>(T[,] source)
        {
            for (int i = 0; i < source.GetLength(0); i++)
            {
                yield return GetByRow(source, i);
            }
        }

        static IEnumerable<T> GetByRow<T>(T[,] source, int row)
        {
            for (int i = 0; i < source.GetLength(1); i++)
            {
                yield return source[row, i];
            }
        }