VB.NET - Print to centre middle of page

I have a Windows Forms Application that sends a couple of lines of text, specifically a customer name and current date + 1 month to a printer. So far I have managed to get it to print in the middle of the page but I need it to print in the middle centre. I mean not just centred page width but also centred page height.
Here's my code so far:

Friend TextToBePrinted As String

Dim print = MessageBox.Show("Would you like to print a retain slip to attach to the computer?", "Print retain slip", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
                If print = Windows.Forms.DialogResult.Yes Then
                    TextToBePrinted = Form1.txtRetainName.Text & vbCrLf & Date.Now.AddMonths(1)
                    Dim prn As New Printing.PrintDocument
                    Dim printer As String = "HP LaserJet P3010 Series UPD PCL 6"
                    Using (prn)
                        prn.PrinterSettings.PrinterName = printer
                        AddHandler prn.PrintPage, _
            AddressOf Me.PrintPageHandler
                        prn.Print()
                        RemoveHandler prn.PrintPage, _
                           AddressOf Me.PrintPageHandler
                    End Using
                End If

Private Sub PrintPageHandler(ByVal sender As Object, _
       ByVal args As Printing.PrintPageEventArgs)
        'Dim myFont As New Font("Arial", 22, FontStyle.Bold)
        'args.Graphics.DrawString(TextToBePrinted, _
        '   New Font(myFont, FontStyle.Regular), _
        '   Brushes.Black, 50, 50)
        Dim sngCenterPage As Single
        Static fntHeadingFont As New Font("Arial", 22, FontStyle.Bold)
        sngCenterPage = Convert.ToSingle(args.PageBounds.Width / 2 - args.Graphics.MeasureString _
                                         (Form1.txtRetainName.Text & vbCrLf & Date.Now.AddMonths(1), fntHeadingFont).Width / 2)
        '()
        args.Graphics.DrawString(Form1.txtRetainName.Text & vbCrLf & Date.Now.AddMonths(1), fntHeadingFont, Brushes.Black, sngCenterPage, 2)
    End Sub

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This works fine as it centres it in the middle at the top of the page but I need it in the middle at the centre of the page