static void Main()
        {
            var matrix = new[,]
            {
                {1, 2, 3},
                {4, 5, 6},
                {7, 8, 9}
            };

            Stack<int> stack = new Stack<int>(matrix.Cast<int>());

            FillMatrix(matrix, stack);

            PrintMatrix(matrix);
        }

        static void FillMatrix<T>(T[,] matrix,IEnumerable<T> source)
        {
            using (IEnumerator<T> iterator = source.GetEnumerator())
            {
                for (int row = 0; row < matrix.GetLength(0); row++)
                {
                    for (int col = 0; col < matrix.GetLength(1); col++)
                    {
                        if (iterator.MoveNext())
                        {
                            matrix[row, col] = iterator.Current;
                        }
                        else
                        {
                            return;
                        }
                    }
                }
            }
        }