private void btnDownload_Click(object sender, EventArgs e)
        {
            try
            {
                WebClient webClient = new WebClient();
                webClient.DownloadFile("http://image.baidu.com/i?ct=503316480&z=1&tn=baiduimagedetail&word=%BA%A3%B6%FB%D0%D6%B5%DC%2Epng&in=22383&cl=2&cm=1&sc=0&lm=-1&pn=3&rn=1&di=2063631080&ln=10&fr=", "100_100_162938.png");
                picShow.Image = Image.FromFile("100_100_162938.png");
            }
            catch (Exception ex)
            {
                
               MessageBox.Show(ex.ToString());
            }
        }结果显示内存不足,请教各位高手