GDI+中发生一般性错误之文件被占用

        public Image GetImageFromStream(string fileName)
        {
            Image img = null;
            try
            {
                FileStream fs = File.OpenRead(fileName);
                img = Image.FromStream(fs);
                fs.Close();
            }
            catch (IOException ie)
            {
                MessageBox.Show(ie.Message);
            }
            return img;
        }