Difference Widhs shown in ItextSharp and printdocument

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VB

itextsharp

Hi - when measure the width of a string in printdocument and itextsharp are differ

the code is below

Private Sub PrintPage(ByVal sender As Object, ByVal e As System.Drawing.Printing.PrintPageEventArgs)
       Dim fReportFont As System.Drawing.Font

       egraphics = e.Graphics
       egraphics.PageUnit = GraphicsUnit.Point
       fReportFont = New System.Drawing.Font(Trim("Helvetica"), 60, FontStyle.Regular)
       MsgBox(egraphics.MeasureString("Abcdghijyzw", fReportFont).Width)
       egraphics.DrawString("Abcdghijyzw", fReportFont, New SolidBrush(Color.Black), 100, 100, System.Drawing.StringFormat.GenericTypographic)

   End Sub

Private Sub ITextSharpPrint()

        Using fs As System.IO.FileStream = New FileStream("C:\Kgm.pdf", FileMode.Create)

            Dim document As New iTextSharp.text.Document(PageSize.A4, 0, 0, 0, 0)
            Dim writer As PdfWriter = PdfWriter.GetInstance(document, fs)
            Dim lstrString As String
            Dim tFont As iTextSharp.text.Font
            Dim ltemp As Double
            Dim l1 As Double
            Dim l2 As Double

            document.Open()
            Dim cb As PdfContentByte = writer.DirectContent

            cb.BeginText()

            lstrString = "Abcdghijyzw"

            tFont = FontFactory.GetFont("Helvetica", 60, 0)

            Dim lbase As BaseFont
            lbase = tFont.BaseFont
            l1 = lbase.GetAscentPoint(lstrString, tFont.Size)
            l2 = Math.Abs(lbase.GetDescentPoint(lstrString, tFont.Size))
            ltemp = l1 + l2


            MsgBox(lbase.GetWidthPoint(lstrString, 60))


            cb.SetFontAndSize(tFont.BaseFont, 60)
            cb.SetTextMatrix(100, document.PageSize.Height - (100 + ltemp))
            cb.ShowText(lstrString)

            cb.EndText()
            document.Close()
            writer.Close()
            fs.Close()

        End Using
    End Sub

in the above code the 2 msgboxes shown different values - ie. 363.5 and 333.42 what went wrong?