Estou usando o System.Net.Mail para enviar e-mails através do meu aplicativo. Eu estava tentando enviar e-mails com os anexos com o seguinte código.

<code>    Collection<string> MailAttachments = new Collection<string>();
    MailAttachments.Add("C:\\Sample.JPG");
    mailMessage = new MailMessage();
    foreach (string filePath in emailNotificationData.MailAttachments)
    {
      FileStream fileStream = File.OpenWrite(filePath);
      using (fileStream)
       {
        Attachment attachment = new Attachment(fileStream, filePath);
        mailMessage.Attachments.Add(attachment);
       }
    }
     SmtpClient smtpClient = new SmtpClient();
     smtpClient.Host = SmtpHost;
     smtpClient.Send(mailMessage);
</code>

Quando eu envio os emails com os anexos, isso gera uma exceção, como segue.

<code>Cannot access a closed file.
at System.IO.__Error.FileNotOpen()
at System.IO.FileStream.Read(Byte[] array, Int32 offset, Int32 count)
at System.Net.Mime.MimePart.Send(BaseWriter writer)
at System.Net.Mime.MimeMultiPart.Send(BaseWriter writer)
at System.Net.Mail.Message.Send(BaseWriter writer, Boolean sendEnvelope)
at System.Net.Mail.MailMessage.Send(BaseWriter writer, Boolean sendEnvelope)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
</code>