Send attachment from infopath form to email - C#

Hello,
i'm here again.
Today I try to send an attachment from infopath form to and email.
Howto ?
I have found this article, but i'm unsure if I need to include that class.

What I want is something like:

XPathNavigator root = MainDataSource.CreateNavigator();
string attachment = root.SelectSingleNode("/my:mineFelter/my:grp5/my:fileAttachment", NamespaceManager).Value;
msg.Attachment.Add(attachment);

But this fails of course, attachment should propably by a file or attachment datatype, but how ?

Jakob

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Jakob Olsen