Mail, alternativeView créeent pièce jointe inutile

Bonjour

J'essai d'envoyer un mail content une gridview en HTML. J'ai des images présentes dans cette gridview.
Pour cela j'utilise AlternateViewFromString et LinkedResource pour inclure les images dans le corps du mail et non en pièce jointes. Hors lorsque mon mail est envoyé, j'ai toujours un fichier en pièce jointe du type "ATT4476845.dat"
Ma gridview et mes images s'affichent bien.
Mais ce fichier joint ne devrait pas exister.
Voicis mon code.
Merci pour votre aide

Code:

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 'Get the report
        Dim report As New SUSReportsFactory
        Dim gridReportHTML As GridView = report.GetDataGridFromDataTable(report.SelectReportByServerPatchingForHTMLMail(275, 22))
        Dim htmlView As AlternateView
 
        'PLAIN VIEW
        'Dim gridReportPlain As GridView = report.GetDataGridFromDataTable(report.SelectReportByServerPatchingForPlainMail(275, 22))
        'Dim stringMailContentPlain As String = GridViewToHtml(gridReportPlain)
        Dim plainView As AlternateView = AlternateView.CreateAlternateViewFromString("Canot display Gridview in HTML", Nothing, "text/plain")
 
 
        ' HTML VIEW
        Dim stringMailContentHTML As String = GridViewToHtml(gridReportHTML)
        stringMailContentHTML = stringMailContentHTML.Replace("&lt;", "<")
        stringMailContentHTML = stringMailContentHTML.Replace("&gt;", ">")
 
        htmlView = AlternateView.CreateAlternateViewFromString(stringMailContentHTML, Nothing, "text/html")
 
        Dim err As New LinkedResource("E:\BetaMom\img\Error-32x32.png")
        err.ContentId = "err"
        err.TransferEncoding = TransferEncoding.Base64
 
        Dim info As New LinkedResource("E:\BetaMom\img\InfoBox-32x32.png")
        info.ContentId = "info"
        info.TransferEncoding = TransferEncoding.Base64
 
        Dim warning As New LinkedResource("E:\BetaMom\img\Warning-32x32.png")
        warning.ContentId = "warning"
        warning.TransferEncoding = TransferEncoding.Base64
 
        'add the LinkedResource to the appropriate view
        htmlView.LinkedResources.Add(err)
        htmlView.LinkedResources.Add(info)
        htmlView.LinkedResources.Add(warning)
 
 
 
        'Public Sub sendMail(ByVal userMail As MailAddress, ByVal server As SUSServer)
        Dim mail As MailMessage = New MailMessage
 
        mail.AlternateViews.Add(plainView)
        mail.AlternateViews.Add(htmlView)
 
        mail.From = New MailAddress("aaa@aaa.com", "ssss")
 
        mail.To.Add("aaa@aaa.com")
 
        mail.Sender = New MailAddress("aaa@aaa.com", "ssss")
        mail.ReplyTo = New MailAddress("aaa@aaa.com", "ssss")
        mail.Subject = "SUS"
        mail.Attachments.Clear()
 
        Dim smtpCli As SmtpClient = New SmtpClient("xxx")
        smtpCli.Send(mail)
    End Sub
 
    Private Function GridViewToHtml(ByVal gv As GridView) As String
        Dim sb As StringBuilder = New StringBuilder()
        Dim sw As StringWriter = New StringWriter(sb)
        Dim hw As HtmlTextWriter = New HtmlTextWriter(sw)
        gv.RenderControl(hw)
        Return sw.ToString()
    End Function