I'm trying to generate PDF file in memory using MemoryStream. But MemoryStream is closed and unaviable for reading after render method is completed.

I have seen an example on how to do it in Java using ByteArrayOutputStream but no example was provided in .NET.

Thank you
...
MemoryStream msPDF = new MemoryStream();
msPDF.Seek(0,System.IO.SeekOrigin.Begin);
pd4ml.render(msHTML,msPDF, new System.Uri("http://localhost/cf"));
byte[] baPDF = new byte[msPDF.Length];//this line produces an exception
msPDF.Read(baPDF,0,(int) msPDF.Length);

Exactly the same thing happens to me

This is a common problem with MemoryStream usage in code ported from java.

Try this workaround (it works fine for me):
http://connect.microsoft.com/VisualStudio/feedback/details/164680/streamwriter-incorrectly-disposes-underlying-stream
Basically decorate the underlying memory stream (the argument to StreamWriter) as:
streamWriter(new NonDisposingStreamDecorator(memoryStream))

Alex