Printer Delivery Sample Modified

I am trying to modify the Printer Delivery Sample (RS 2005).
The original sample works fine: there was no any problem with deployment and running it.

What I need to accomplish is saving each delivered report as a local XML file.

For now (to start with), I'm just trying to read the rendered report as XML, and write the string (whatever the report contains) into a text file.

I added the following code to the PrintReport(...) method in the PrinterDeliveryProvider.cs file:

deviceInfo = String.Format(
System.Globalization.CultureInfo.InvariantCulture,
@"<DeviceInfo><OutputFormat>{0}</OutputFormat></DeviceInfo>",
"xml");
RenderedOutputFile[] testFiles = notification.Report.Render("XML", deviceInfo);

using (FileStream fs = File.Create(@"C: est est.txt"))
{
using (StreamWriter sw = new StreamWriter(fs))
{
sw.WriteLine("******************");

try
{
Stream streamTemp = (Stream)testFiles[0].Data;
byte [] byteData = new byte[streamTemp.Length];
for (int i = 0; i < byteData.Length; i++)
{
byteData[ i ] = (byte)streamTemp.ReadByte();
}

using (MemoryStream ms = new MemoryStream(byteData))
{
string result = Convert.ToBase64String(ms.ToArray());
sw.WriteLine(result);
}
}
catch (Exception ex)
{
sw.WriteLine(ex.Message);
}

sw.Flush();
}
}


After I re-deploy the modified assembly and create a simple subscription, it fires, and there are no exceptions. But instead of some good-looking XML in the test.txt file, I get this:

******************
///////////////////////////////////////////////////////////////////////////////////////////////////////////////

[Actually, there are much more slashes, but I am showing just the beginning of the file - for brevity...]

When I run this report in ReportManager and export it as "XML file with report data", that XML exported file looks exactly as I expect it to. So, the data is there, in the report, but how do I extract it?

I've been trying to figure out why I am not getting the real content of the report in XML format.
Maybe, this line is wrong: RenderedOutputFile[] testFiles = notification.Report.Render("XML", deviceInfo);
AND/OR this line is wrong: deviceInfo = String.Format(................etc.
AND/OR I am using a wrong method for converting the Stream to a string.
...or, something else?

Could someone kindly help me figure out what I'm doing wrong, please?