1.
绝对路径:
this.pictureBox2.Image=Image.FromFile("D://1.jpg");
2.
相对路径:
Application.StartupPath;
可以得到程序根目录
this.pictureBox2.Image=Image.FromFile(Application.StartupPath "//1.gif");
3.
获得网络图片的路径
this.pictureBox2.Image= Image.FromStream
(System.Net.WebRequest.Create
(http://www.mxmx.com/logo.gif).GetResponse().GetResponseStream());