Error while sending e-mails with attachments using SmtpClient::SendAsync

microsoft.public.dotnet.framework

14 May 2007 12:56 AM

mukesh bhakta

Error while sending e-mails with attachments using
SmtpClient::SendAsync Options
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mukesh bhakta    View profile
More options May 14, 10:46 am

Newsgroups: microsoft.public.dotnet.framework.windowsforms
From: mukesh bhakta <mukesh_bha***@hotmail.com>
Date: 13 May 2007 17:46:04 -0700
Local: Mon, May 14 2007 10:46 am
Subject: Error while sending e-mails with attachments using
SmtpClient::SendAsync
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Hi guys,

I get an error when I send e-mails with attachments using SmtpClient.
Following is the code snippet -

MailMessage msg = new MailMessage(from, to);
/*...all the initialization goes here */

byte [] data = /* some binary data */
using (MemoryStream ms = new MemoryStream(/*att.Contents*/))
{
          using (StreamWriter sw = new StreamWriter(ms))
          {
            sw.Write(data);
            sw.Flush();
            ms.Position = 0;

            System.Net.Mail.Attachment natt = new
System.Net.Mail.Attachment(
                                            ms, "test.txt");
            msg.Attachments.Add(natt);
          }

}

private static void sendCompletedCallback(object sender,
AsyncCompletedEventArgs e)
    {
      if (e.Cancelled)
      {
         logmsg("E-mail send cancelled");
      }
      else if (e.Error != null)
      {
        System.Diagnostics.Debug.WriteLine(e.Error.ToString());
        logmsg(e.Error.Message + ' ' +
e.Error.InnerException.Message);
      }
      else
      {
        logmsg(success)
      }

}

The error I am getting in the above method is -

System.Net.Mail.SmtpException: Failure sending mail. --->
System.NotSupportedException: Stream does not support reading.
   at System.Net.Mime.MimeBasePart.EndSend(IAsyncResult asyncResult)
   at System.Net.Mail.Message.EndSend(IAsyncResult asyncResult)
   at System.Net.Mail.SmtpClient.SendMessageCallback(IAsyncResult
result)
   --- End of inner exception stack trace ---

What am I doing wrong? The code seems to work fine if no attachment
is
supplied.

cheers

MB