Error erasing a file

[fallnwrld]

I have the .Net program sending an email and adding a file as an attachment

  Private Sub SendSMTP(ByVal strFrom As String, ByVal strTo As String, ByVal strSubject As String, ByVal strBody As String, ByVal strCC As String, ByVal strAttachments As String)
        Dim insMail As New MailMessage(New MailAddress(strFrom), New MailAddress(strTo))
        With insMail
            .Subject = strSubject
            .Body = strBody
            '.CC.Add(New MailAddress(strCC))
            If Not strAttachments.Equals(String.Empty) Then
                Dim strFile As String
                Dim strAttach() As String = strAttachments.Split(";"c)
                For Each strFile In strAttach
                    .Attachments.Add(New Attachment(strFile.Trim()))
                Next
                strFile = Nothing

            End If
        End With
        Dim smtp As New System.Net.Mail.SmtpClient
        smtp.Host = strSMTP
        smtp.Port = 25
        smtp.Send(insMail)

        smtp = Nothing
        insMail = Nothing
        strAttachments = Nothing

    End Sub

When I tried to erase the file at the end it says the the file is still in use. I tried declaring the variables to nothing and still doesn't help. If I dont send the file in the email I can erase it with out a problem. Any suggestions?

[dglienna]

Is it getting sent? Sounds like it's only getting queued, and that would lock it.

Do you have Outlook sending immediately? (I don't and that happens in VB6)

[Marraco]

I have the .Net program sending an email and adding a file as an attachment
...

I would check that the mail server has released the file. (don't know how)

[jmedved]

When I tried to erase the file at the end it says the the file is still in use. I tried declaring the variables to nothing and still doesn't help. If I dont send the file in the email I can erase it with out a problem. Any suggestions?

Declaring variables to nothing will not do you much good. You should Dispose of MailMessage once you are done with it (also check Using statement).
If that does not help, download Process Explorer to check who is actually holding your file.

[HanneSThEGreaT]

Have you tried using Application.DoEvents before deleting the file ¿
I know some may have issues with DoEvents, but I honestly think it may be worth at least a shot