Mail i asp.net

Jeg får denne fejl-meddelse:

BC30390: 'System.Web.Mail.SmtpMail.Private Sub New()' is not accessible in this context because it is 'Private'.

udfra denne kode:

<%@ Page Language="VB" %>
<%@ import Namespace="System.Web.Mail" %>
<script runat="server">

public Sub btnSend_Click(ByVal Sender As System.Object, ByVal e As System.EventArgs)

              Dim objSmtpMail As New SmtpMail()

              objSmtpMail.Send(txtTil.Text, txtFra.Text, txtEmne.Text, txtTekst.Text)

              objSmtpMail = nothing
    end sub