C#生成验证码

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public static bool GenRad(string strRadnum,System.IO.Stream oOutStream,int nWidth,int nHeight)
  {
   System.Drawing.Bitmap oImage;

   try
   {
    oImage=new System.Drawing.Bitmap(nWidth,nHeight);


   }
   catch(System.Exception Dr_ERr)
   {
    CardSale.Tools.ErrorLog.WriteLog("Photo/GenRad(string strRadnum,System.IO.Stream oOutStream,int nWidth,int nHeight)",Dr_ERr.Message);
    return false;
   }

   System.Drawing.Graphics oGr=System.Drawing .Graphics.FromImage(oImage);
   System.Drawing.SolidBrush oBack=new System.Drawing.SolidBrush(System.Drawing.Color.FromArgb(255,255,255));
   oGr.FillRectangle(oBack,0,0,nWidth,nHeight);
   System.Drawing.Pen oPen=new System.Drawing.Pen(System.Drawing.Color.Black);
   System.Drawing.Font oFont=new System.Drawing.Font(System.Drawing.FontFamily.GenericSansSerif,12);
   System.Drawing.SolidBrush oLine=new System.Drawing.SolidBrush(System.Drawing.Color.FromArgb(0,0,0));
   System.Drawing.Imaging.ImageAttributes imageAttr = new System.Drawing.Imaging.ImageAttributes();
   imageAttr.SetGamma(0.1F);

   oGr.DrawString(strRadnum,oFont,oLine,5,0);
   try
   {
    oImage.Save(oOutStream,System.Drawing.Imaging.ImageFormat.Jpeg);
   }
   catch
   {
    oGr.Dispose();
    oImage.Dispose();
    return false;
   }
   oGr.Dispose();
   oImage.Dispose();
   return true;
  }