public async Task DownloadMarsRovePhotos(List <Photos> photos)
        {
            FileDownload filedownload = new FileDownload();

            Console.WriteLine("Downloading Files... \n");
            foreach (var item in photos)
            {
                await filedownload.DownloadImage(item.img_src.Trim(), Constant.ImageFolder);
            }
            Console.WriteLine("All Files Downloaded Successfully..");
        }
        private string sections()
        {
            FileDownload filedownload = new FileDownload();
            string       sections     = "";

            foreach (var date in dates)
            {
                sections += "<div class='panel panel-default'>";
                sections += String.Format("<div class='panel-heading'>{0}</div>", date);
                sections += "<div class='panel-body'>";
                sections += "<div class='center slider'>";
                var photodates = from photo in photos where photo.earthdate == date select photo;
                foreach (var img in photodates)
                {
                    sections += "<div>";
                    sections += String.Format("<img src='{0}/{1}'/>", Constant.ImageFolder, filedownload.getFileName(img.img_src));
                    sections += "</div>";
                }
                sections += "</div>";
                sections += "</div>";
                sections += "</div>";
            }
            return(sections);
        }