Problem with difference between System.Web.Mail and System.Net.Mail in using attachments

I have a web .Net app which sends emails with attachments.  After the email is sent I clean up aftermyself and delete the attachments from disk.   In upgrading to .Net 2  I changed the email logic from using system.web.mail to  (of course vs is telling me system.web.mail is obsolete).
In .Net 1.1,  the files deleted with no problem but in .Net 2 when I attempt to delete  I receive

The process cannot access the file ...' because it is being used by another process.

If I change the code back to using system.web.mail I can delete the files.  So it would appear that something about the mail object, using,  keeps the file in use.  I found the same is true if I attempt to overwrite the files using something like File.Copy(from,to, true).   Why in .Net 2  would the disk files still be in use...or at least how can they be released?

Below is snip of code, both the 1.1 and 2.0 version.

.Net 1.1   code
        Dim mailObj As New System.Web.Mail.MailMessage()
        With mailObj
            .From = fromName
            .To = toName
            .Body = body.ToString
            .Priority = MailPriority.High
            .Subject = "Test"
            .BodyFormat = Mail.MailFormat.Html
            .Attachments.Add(New System.Web.Mail.MailAttachment(attachment1Name))
            .Attachments.Add(New System.Web.Mail.MailAttachment(attachment2Name))

        End With

        System.Web.Mail.SmtpMail.SmtpServer = server

.Net 2.0 code
        Dim mailObj As New MailMessage(fromName, toName)
        With mailObj
            .Body = body.ToString
            .Priority = MailPriority.High
            .Subject = "Test"
            .IsBodyHtml = True
            .Attachments.Add(New Attachment(attachment1Name))
            .Attachments.Add(New Attachment(attachment2Name))

        End With

        Dim mailserver As  New SmtpClient(server)



4/25/2006 6:18:42 PM 1016 articles. 0 followers. Follow

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should work.

1/4/2007 1:29:26 PM

 Well .. it's over a year , but anyway :

Read this ..

I've got to that one trying to figure out why I have some delay with my Send method .

And it turns out that it also holds the attached files..

11/13/2007 5:28:10 PM

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