private void BtnPreview_Click(object sender, EventArgs e) { var response = WebRequestUtil.GetAdsImg(this.comboBox1.SelectedIndex + 1); 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); } } }