Print to XPS without a Save As dialog - vb.net

Question

How can I save an xps file by printing to a virtual printer without using the Save File As dialog? When I call the print method, a dialog automatically pops up asking the user to specify the file name and path. This only works when creating brand new files; it throws an error 'you do not have permission to write to that file...' if I attempt to overwrite an existing file. Anyways, I want the user to be able to specify the file name in my own dialog, not the one that is autamatically called by the printDocument's Print method.
Public Event PrintPage As System.Drawing.Printing.PrintPageEventHandler
Private WithEvents Doc As New Printing.PrintDocument
Public Sub SaveXPSFile()
Doc.PrinterSettings.PrinterName = "Microsoft XPS Document Writer"
Doc.PrinterSettings.PrintFileName = "C:\Users\POConnell\Documents\t.xps"
Doc.Print()
Doc.Dispose()
End Sub
Private Sub PrintDocument1_PrintPage(ByVal sender As Object, ByVal e As System.Drawing.Printing.PrintPageEventArgs) Handles Doc.PrintPage
'drawing commands go here
End sub

Answer 1

It's a couple of months late, but here we go.
2 questions, two answers.
Question 1:
How can I save an xps file by printing to a virtual printer without using the Save File As dialog?
Answer 1: You were close. I think you're looking for
Doc.DefaultPageSettings.PrinterSettings.PrintToFile = True
Doc.DefaultPageSettings.PrinterSettings.PrintFileName = "C:\Users\POConnell\Documents\t.xps"
Here is my implementation:
(Legal paper size, landscape mode)
Using prn As New PrintDocument
With prn
.PrinterSettings.PrinterName = "Microsoft XPS Document Writer"
AddHandler .PrintPage, _
AddressOf Me.PrintPageHandler
.DefaultPageSettings.Landscape = landscape
.DefaultPageSettings.PaperSize = New PaperSize("Legal", 850, 1400)
If My.Computer.FileSystem.FileExists("C:\temp\Log.oxps") Then My.Computer.FileSystem.DeleteFile("C:\temp\Log.oxps")
.DefaultPageSettings.PrinterSettings.PrintToFile = True
.DefaultPageSettings.PrinterSettings.PrintFileName = "C:\temp\Log.oxps"
.Print()
RemoveHandler .PrintPage, _
AddressOf Me.PrintPageHandler
End With
End Using
As you can see, I use the oxps file format, but it should still work just the same for you.
Question 2: it throws an error 'you do not have permission to write to that file...' if I attempt to overwrite an existing file.
Answer 2: Check if the file already exists prior to printing the file, and delete it if it does. Of course it will fail attempting to create a file that already exists.
For some reason using My.Computer.FileSystem.DeleteFile is faster than the traditional Kill() and System.IO.File.Delete, which both require the thread to sleep for ~1-200ms prior to recreating the file, or else a different access denied error will occur.
Hopefully this helps someone in the future!