merging .pdf files using vb.net

Is there a way to merge multiple documents to print to 'Microsoft XPS Document Writer' or 'CutePDF Writer' using VB.NET?

I would like to try this method because even if I use a wait for process to complete, with the code attached, another print job could easily slip in-between.  The two printer methods listed above are currently on all the computers that will run this program.

I am trying to print a list of files including .docx and .pdf...  

the problem that I having is that when I go to print to the printer the order is not as expected.  I want the order to print in the order of the enclosure list, which when I debug, the order is correct. Just not going to the print que correctly.  I do not want to install a 3rd party .dll

Please help!!!!

enclosureList = [1]"C:\..\..\wordfile.docx"
                            [2]"C:\..\..\pdfFile_1.pdf"
                            [3]"C:\..\..\pdfFile_2.pdf"
                             ...
                            [11]"C:\..\..\pdfFile_10.pdf"

For x As Integer = 0 To enclosureList.Count - 1
                Dim psInfo As New ProcessStartInfo

                With psInfo
                    .UseShellExecute = True
                    .Verb = "print"
                    .FileName = enclosureList(x)
                    .WindowStyle = ProcessWindowStyle.Hidden
                    Process.Start(psInfo)
                End With
 Next                       

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