c# 下载图片

using System.Net;

private void button1_Click(object sender, EventArgs e)
{
    HttpWebRequest vHttpWebRequest = (HttpWebRequest)WebRequest.Create(
        @"http://www.baidu.com/favicon.ico");
    HttpWebResponse vHttpWebResponse = (HttpWebResponse)vHttpWebRequest.GetResponse();
    Image vFavicon = Image.FromStream(vHttpWebResponse.GetResponseStream());
    pictureBox1.Image = vFavicon;
    vHttpWebResponse.Close();
}