PrintQueue.UserPrintTicket Property

		''' <summary>
		''' Changes the user-default PrintTicket setting of the specified print queue.
		''' </summary>
		''' <param name="queue">the printer whose user-default PrintTicket setting needs to be changed</param>
		Private Shared Sub ChangePrintTicketSetting(ByVal queue As PrintQueue)
			'
			' Obtain the printer's PrintCapabilities so we can determine whether or not
			' duplexing printing is supported by the printer.
			'
			Dim printcap As PrintCapabilities = queue.GetPrintCapabilities()

			'
			' The printer's duplexing capability is returned as a read-only collection of duplexing options
			' that can be supported by the printer. If the collection returned contains the duplexing
			' option we want to set, it means the duplexing option we want to set is supported by the printer,
			' so we can make the user-default PrintTicket setting change.
			'
			If printcap.DuplexingCapability.Contains(Duplexing.TwoSidedLongEdge) Then
				'
				' To change the user-default PrintTicket, we can first create a delta PrintTicket with
				' the new duplexing setting.
				'
				Dim deltaTicket As New PrintTicket()
				deltaTicket.Duplexing = Duplexing.TwoSidedLongEdge

				'
				' Then merge the delta PrintTicket onto the printer's current user-default PrintTicket,
				' and validate the merged PrintTicket to get the new PrintTicket we want to set as the
				' printer's new user-default PrintTicket.
				'
				Dim result As ValidationResult = queue.MergeAndValidatePrintTicket(queue.UserPrintTicket, deltaTicket)

				'
				' The duplexing option we want to set could be constrained by other PrintTicket settings
				' or device settings. We can check the validated merged PrintTicket to see whether the
				' the validation process has kept the duplexing option we want to set unchanged.
				'
				If result.ValidatedPrintTicket.Duplexing = Duplexing.TwoSidedLongEdge Then
					'
					' Set the printer's user-default PrintTicket and commit the set operation.
					'
					queue.UserPrintTicket = result.ValidatedPrintTicket
					queue.Commit()
					Console.WriteLine("PrintTicket new duplexing setting is set on '{0}'.", queue.FullName)
				Else
					'
					' The duplexing option we want to set has been changed by the validation process
					' when it was resolving setting constraints.
					'
					Console.WriteLine("PrintTicket new duplexing setting is constrained on '{0}'.", queue.FullName)
				End If
			Else
				'
				' If the printer doesn't support the duplexing option we want to set, skip it.
				'
				Console.WriteLine("PrintTicket new duplexing setting is not supported on '{0}'.", queue.FullName)
			End If
		End Sub