OpenFileDialog ofd = new OpenFileDialog();
ofd.Title = "选择图片";
ofd.InitialDirectory = "C://Documents and Settings//Administrator//My Documents//My Pictures";
ofd.Filter = "All files(*.*)|*.*";
//“文本文件(*.txt)|*.txt|所有文件(*.*)|*.*”
ofd.FilterIndex = 1;
if (ofd.ShowDialog() == DialogResult.OK)
{
pbBrowse.Image = Image.FromFile(ofd.FileName);
}