private void PreviewPic(string adsImageName) { var response = WebRequestUtil.GetAdsImage(adsImageName); if (response != null) { var data = JsonUtil.Deserialize <QSWResponse <string> >(response.Content); if (!string.IsNullOrEmpty(data.Data)) { var imgBytes = Convert.FromBase64String(data.Data); string imageFile = SaveToCache(imgBytes); this.pictureBox1.Image = new Bitmap(imageFile); } else { this.pictureBox1.Image = null; } } else { this.pictureBox1.Image = null; } }