WindowsFormsApplication1.Form1.showQRImage C# (CSharp) Method

        private void showQRImage()
        {
            var url = String.Format("https://login.weixin.qq.com/qrcode/" + uuid + "?t=webwx&_={0}", get_timestamp());
            Console.WriteLine(url);
            tip = 1;
            WebRequest request = WebRequest.Create(url);
            request.Method = "GET";

            updateUITextLine(info_display, "正在读取二维码，请稍等……", Environment.NewLine, Color.Black);
            using (WebResponse response = request.GetResponse())
            {
                using (Stream stream = response.GetResponseStream())
                {              
                    Image image = Image.FromStream(stream); // should catch timeout exception                   
                    qrcode_img.Invoke(new Action( ()=>
                    {
                        qrcode_img.Image = image;
                        qrcode_img.Height = image.Height;
                        qrcode_img.Width = image.Width;
                    }));

                    start_btn.Invoke(new Action( ()=>
                    {
                        this.Controls.Remove(start_btn);
                        start_btn.Dispose();
                    }));

                    updateUITextLine(info_display, "请使用微信扫描二维码以登录", Environment.NewLine, Color.Black);                 
                }
            }
        }