>Doesn't 'loXmlDocument.Load(loMemoryStream)' fail since loMemoryStream is not populated ?

Correct, at that point oMemoryStream is already being constructed in memory. And, I need to add this stylesheet. However, the command to use is:

loXmlDocument.InsertAfter(loXmlProcessingInstruction, loXmlDocument.FirstChild)

But, when constructing the XML in memory, all I have is oMemoryStream. Does this mean I would have to dump the memory stream into a variable. Load that variable into loXmlDocument. Benefit from its InsertAfter() method. Once inserted, reinitialize oMemoryStream with an updated content. There has to be a way to manipulate something like directly from the oMemoryStream variable. Have you ever did something like this?