How to configure both margins of a page to print?

[AlexMesquita]

How can I make the text stop at the right margin of the page?

Here is the code that I am using. I can only configure the left margin and the text always crosses the right limit of the leaf. Could you help me with that?
Thanks.

    Private Sub PrintDocument1_PrintPage(ByVal sender As System.Object, ByVal texto As System.Drawing.Printing.PrintPageEventArgs) Handles PrintDocument1.PrintPage
        Dim linhasPorPagina As Single = 0
        Dim Posicao_Y As Single = 0
        Dim contador As Integer = 0
        Dim MargemEsquerda As Single = texto.MarginBounds.Left - 50
        Dim MargemSuperior As Single = texto.MarginBounds.Top
        Dim linha As String = Nothing
        Dim FonteDeImpressao As Font = Me.rtbRichText.Font
        Dim meupincel As New SolidBrush(Color.Black)
        Calcula o numero de linhas por p