generateQRCodeFromBase64

  public static Bitmap generateQRCodeFromBase64(str qrCodeText)

 {

     System.Drawing.Bitmap result;

     QRCodeGenerator.ECCLevel eccLevel;

     QRCodeGenerator qrGenerator = new QRCodeGenerator();

     QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrCodeText, QRCodeGenerator.ECCLevel::M);

     QRCode qrCode = new QRCode(qrCodeData);

     result = qrCode.GetGraphic(20);

     System.IO.MemoryStream memoryStream = new System.IO.MemoryStream();

     result.Save(memoryStream, System.Drawing.Imaging.ImageFormat::get_Png());

     return Binary::constructFromMemoryStream(memoryStream).getContainer();

 }