第一种：（此方法比较笨）

在页面上隐藏几个需要改变页面上图片的picturebox，比如下面的picFrom
在需要改变图片的方法处先定义：
System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
然后就可以改变了（比如picTo的图片要改变成picFrom的图片）
this.picTo.Image = ((System.Drawing.Image)(resources.GetObject("picFrom.Image")));

第二种：

使用 FileStream 对象，如下所示：
Dim fs As System.IO.FileStream  ' Specify a valid picture file path on your computer.      fs = New System.IO.FileStream("C:/WINNT/Web/Wallpaper/Fly Away.jpg",  IO.FileMode.Open, IO.FileAccess.Read)  PictureBox1.Image = System.Drawing.Image.FromStream(fs)  fs.Close()

第三种（我认为是比较好的）

使用 Image.FromFile 方法在 PictureBox 控件中加载图片，该图片文件将在您启动应用程序时锁定。
  在应用程序运行时，图片文件保持锁定。 即使在运行时将 Image 属性设置为 Nothing，图片文件仍将锁定。
  PictureBox1.Image = Image.FromFile("C:/WINNT/Web/Wallpaper/Fly Away.jpg")

//默认页面请求

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(DefaultUrl);

            request.Method = "GET";

            request.ContentType = "application/x-www-form-urlencoded";

            request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0.1) Gecko/20100101 Firefox/5.0.1";

            request.Accept = "image/webp,*/*;q=0.8";

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            Stream stream = response.GetResponseStream();

            string WebContent = new StreamReader(stream, System.Text.Encoding.UTF8).ReadToEnd();

            //验证码请求

            request = (HttpWebRequest)WebRequest.Create(CodeUrl);

            request.Method = "GET";

            request.ContentType = "application/x-www-form-urlencoded";

            request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0.1) Gecko/20100101 Firefox/5.0.1";

            request.Accept = "image/webp,*/*;q=0.8";

            request.CookieContainer = lCC;//!Very Important.!!!

            response = (HttpWebResponse)request.GetResponse();

            response.Cookies = lCC.GetCookies(request.RequestUri);

            stream = response.GetResponseStream();

            picCode.Image = Image.FromStream(stream);

            //stream.Dispose();

以上就是本文的全部内容了，希望大家能够喜欢。