文件不能释放问题请看代码.
public   void   AttachText(string   file,   string   logo,   string   logoType,int   x,int   y)
{
MemoryStream   s   =   new   MemoryStream();
Image   img   =   Image.FromFile(file);
Graphics   graphics   =   Graphics.FromImage(img);
graphics.FillRectangle(Brushes.White,   new   Rectangle(0,   0,   img.Width,   img.Height));
graphics.SmoothingMode   =   SmoothingMode.HighQuality;
int   nlen   =   System.Text.Encoding.Default.GetByteCount(logo);
graphics.DrawString(logo,   new   Font( "Arial ",   52,   GraphicsUnit.Pixel),   Brushes.Black,   new   Point(x,   y));
img.Save(s,   img.RawFormat);
graphics.Dispose();
img.Dispose();
FileStream   fi   =   new   FileStream(file,   FileMode.Open,   FileAccess.ReadWrite);
s.WriteTo(fi);
s.Close();
fi.Close();
}

private   void   button1_Click(object   sender,   System.EventArgs   e)
{
AttachText( "C:\\abc.jpg ",textBox1.Text, "Text ",40,40);
pictureBox1.Image   =   Image.FromFile( "c:\\abc.jpg ");
}
功能是替换图片文件中的图片,点一次按钮就把输入的文字以图片的形式写到文件中,
点按钮的时候调用函数AttachText,第一次的时候可以成功,第二次FileStream   fi   =   new   FileStream(file,   FileMode.Open,   FileAccess.ReadWrite);这里就抛异常了,说的是文件正在使用,请问应该怎么释放啊.谢谢


------解决方案--------------------
AttachLogoOnBitmap( "C:\\abc.jpg ",textBox1.Text, "Text ",40,40);
Byte[] bytBLOBData = new Byte[s.Length];
s.Position = 0;
s.Read(bytBLOBData, 0, Convert.ToInt32(s.Length));
MemoryStream stmBLOBData = new MemoryStream(bytBLOBData);
pictureBox1.Image= Image.FromStream(stmBLOBData);;