高手帮忙看看，解释解释

Question

if (openFile.ShowDialog()==DialogResult.OK)
            {
                picStudent.Image.Dispose()；
                File.Copy(openFile.FileName, string.Format(@"data\{0}\{1}.gif", cboClass.Text, txtNumber.Text), true);
                picStudent.Image = Image.FromFile(openFile.FileName);
                picStudent.Image.Tag = openFile.FileName;
            }
为什么我这段代码，加进if语句判断就会出现 data\网编\1.gif正由另一进程使用？（我的picStudnet图像框原先调用了这幅图像）但我原先的代码是这样openFile.ShowDialog();
picStudent.Image.Dispose();
                File.Copy(openFile.FileName, string.Format(@"data\{0}\{1}.gif", cboClass.Text, txtNumber.Text), true);
                picStudent.Image = Image.FromFile(openFile.FileName);
                picStudent.Image.Tag = openFile.FileName;却没出现这个问题

Answer 1

picStudent.Image.Dispose();//放到if外边
if (openFile.ShowDialog()==DialogResult.OK)
{
    File.Copy(openFile.FileName, string.Format(@"data\{0}\{1}.gif", cboClass.Text, txtNumber.Text), true);
    picStudent.Image = Image.FromFile(openFile.FileName);
    picStudent.Image.Tag = openFile.FileName;
}

Answer 2

picStudent.Image.Dispose();这有什么用？？