ASP.Net(How to fetch files)?

            if (Directory.Exists(path))

            {

                string[] file = System.IO.Directory.GetFiles(path);

                string FileName;

                string DisplayFileName;

                double FileSize;

                string FileSizeMB;

                int i = 0;

                foreach (string s in file)

                {

                    System.IO.FileInfo f1 = null;

                    try

                    {

                        f1 = new System.IO.FileInfo(s);

                    }

                    catch (System.IO.FileNotFoundException ae)

                    {

                        continue;

                    }

                    FileName = f1.Name.ToString();

                    DisplayFileName = Path.GetFileNameWithoutExtension(f1.Name.ToString());

                    FileSize = f1.Length / CalculateSquare(1024);

                    FileSizeMB = string.Format("{0:###.00}", FileSize).ToString() + " MB";

                    if ((FileName.Substring(FileName.Length - 4, 4)).ToUpper() == (".pdf").ToUpper())

                    {

                        grdDetail.Rows.Insert(i);

                        grdDetail.Rows[i].Cells[0].Value = int.Parse((i + 1).ToString()).ToString("000");

                        grdDetail.Rows[i].Cells[1].Value = DisplayFileName.ToString();

                        grdDetail.Rows[i].Cells[2].Value = FileName.ToString();

                        grdDetail.Rows[i].Cells[3].Value = FileSizeMB.ToString();

                    }

                    i = i + 1;

                }

            }

            else

            {

                MessageBox.Show("Directory does not exist");

            }

        public static double CalculateSquare(Int32 number)

        {

            return Math.Pow(number, 2);

        }