MemoryStream memoryStream = new MemoryStream((byte[])Resources.ResourceManager.GetObject(fileName));

public virtual Bitmap Encode(String content)
    {
      if (QRCodeUtility.IsUniCode(content))
      {
         return Encode(content, Encoding.Unicode);
      }
      else
      {
         return Encode(content, Encoding.ASCII);
      }
    }

public virtual Bitmap Encode(String content)
    {
        if (QRCodeUtility.IsUniCode(content))
{
return Encode(content, Encoding.GetEncoding("gb2312"));
}
else
{
return Encode(content, Encoding.ASCII);
}
    }

QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            String encoding = cboEncoding.Text ;
            if (encoding == "Byte") {
                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
            } else if (encoding == "AlphaNumeric") {
                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;            
            } else if (encoding == "Numeric") {
                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.NUMERIC;            
            }
            try {
                int scale = Convert.ToInt16(txtSize.Text);
                qrCodeEncoder.QRCodeScale = scale;
            } catch (Exception ex) {
                MessageBox.Show("Invalid size!");
                return;
            }
            try {
                int version = Convert.ToInt16(cboVersion.Text) ;
                qrCodeEncoder.QRCodeVersion = version;
            } catch (Exception ex) {
                MessageBox.Show("Invalid version !");
            }
            string errorCorrect = cboCorrectionLevel.Text;
            if (errorCorrect == "L")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;
            else if (errorCorrect == "M")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
            else if (errorCorrect == "Q")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;
            else if (errorCorrect == "H")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;
            Image image;
            String data = txtEncodeData.Text;
            image = qrCodeEncoder.Encode(data);                      
            picEncode.Image = image;

/// <summary>  
      /// 生成二维码.  
      /// </summary>  
      /// <param name="data">需要添加进去的文本</param>  
      /// <returns></returns>  
      public System.Drawing.Image GCode(String data)  
      {  
          QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();  
          qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;  
          qrCodeEncoder.QRCodeScale = 5;  
          qrCodeEncoder.QRCodeVersion = 7;  
   
          qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;  
          var pbImg = qrCodeEncoder.Encode(data, System.Text.Encoding.UTF8);  
         var width = pbImg.Width / 10;  
        var dwidth = width * 2;  
          Bitmap bmp = new Bitmap(pbImg.Width + dwidth, pbImg.Height + dwidth);  
          Graphics g = Graphics.FromImage(bmp);  
          var c = System.Drawing.Color.White;  
          g.FillRectangle(new SolidBrush(c), 0, 0, pbImg.Width + dwidth, pbImg.Height + dwidth);  
          g.DrawImage(pbImg, width, width);  
          g.Dispose();  
         return bmp;  
      }  
   
     /// <summary>  
      /// 调用此函数后使此两种图片合并，类似相册，有个  
    /// 背景图，中间贴自己的目标图片  
     /// </summary>  
      /// <param name="sourceImg">粘贴的源图片</param>  
      /// <param name="destImg">粘贴的目标图片</param>  
      public static System.Drawing.Image CombinImage(System.Drawing.Image imgBack, string destImg)  
      {  
  
          System.Drawing.Image img = System.Drawing.Image.FromFile(destImg);        //照片图片    
          if (img.Height != 50 || img.Width != 50) {  
              img = KiResizeImage(img, 50, 50, 0);  
          }  
          Graphics g = Graphics.FromImage(imgBack);  
   
          g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height);      //g.DrawImage(imgBack, 0, 0, 相框宽, 相框高);   
   
          //g.FillRectangle(System.Drawing.Brushes.White, imgBack.Width / 2 - img.Width / 2 - 1, imgBack.Width / 2 - img.Width / 2 - 1,1,1);//相片四周刷一层黑色边框  
   
          //g.DrawImage(img, 照片与相框的左边距, 照片与相框的上边距, 照片宽, 照片高);  
   
         g.DrawImage(img, imgBack.Width / 2 - img.Width / 2, imgBack.Width / 2 - img.Width / 2 , img.Width, img.Height);  
          GC.Collect();  
          return imgBack;  
      }  
   
      /// <summary>  
      /// Resize图片  
      /// </summary>  
      /// <param name="bmp">原始Bitmap</param>  
      /// <param name="newW">新的宽度</param>  
      /// <param name="newH">新的高度</param>  
      /// <param name="Mode">保留着，暂时未用</param>  
      /// <returns>处理以后的图片</returns>  
      public static System.Drawing.Image KiResizeImage(System.Drawing.Image bmp, int newW, int newH, int Mode)  
      {  
          try 
          {  
              System.Drawing.Image b = new Bitmap(newW, newH);  
              Graphics g = Graphics.FromImage(b);  
   
              // 插值算法的质量  
              g.InterpolationMode = InterpolationMode.HighQualityBicubic;  
   
             g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);  
             g.Dispose();  
   
              return b;  
          }  
         catch 
          {  
              return null;  
      }  
}