protected void Button1_Click(object sender, EventArgs e)
        {
            int sheet_number = Convert.ToInt32(TextBox1.Text);
            int column_number = Convert.ToInt32(TextBox2.Text);
            string cell_entry = "";
            List<string> list_images = new List<string>();

            foreach (Row row in (((Workbook.Worksheets(excel_path)).ElementAtOrDefault(sheet_number-1)).Rows))
            {
                if (row.Cells.ElementAtOrDefault(column_number-1) != null)
                {
                    cell_entry = (row.Cells.ElementAtOrDefault(column_number-1)).Text;
                    list_images.Add(cell_entry);
                }
            }

            List<string> distinct_images = list_images.Distinct().ToList();
            foreach (var images in distinct_images)
            {
                System.Drawing.Image image = DownloadImageFromUrl("https://media.loylty.com/Gallery/" + images + ".jpg");
                if (image != null)
                {
                    string rootPath = ConfigurationManager.AppSettings["FolderPath1"];
                    string fileName1 = Server.MapPath(rootPath + images + ".jpg");
                    image.Save(fileName1);
                }
            }
        }