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MailAddressCollection addresses error on sending mail with system.net.mail

while using system.net.mail to send email in asp.net, had encountered the following error:

System.ArgumentException: The parameter 'addresses' cannot be an empty string. Parameter name: addresses at System.Net.Mail.MailAddressCollection.Add(String addresses) at SendMail.btnSend_Click(Object sender, EventArgs e)

MailMessage mailMessage = new MailMessage();

mailMessage.To.Add(txtReceiver.Text);
mailMessage.CC.Add(txtCc.Text);
mailMessage.Bcc.Add(txtBcc.Text);

mailMessage.From = new MailAddress(txtSender.Text, "asdasda");
                  //      mailMessage.From = txtSender.Text;
                  //      mailMessage.To = txtReceiver.Text;
                  //      mailMessage.Cc = txtCc.Text;
                  //      mailMessage.Bcc = txtBcc.Text;
                        mailMessage.Subject = txtSubject.Text;
                        mailMessage.Body = txtBody.Text;

List<string> lststring = new List<string>();

lststring.Add(txtReceiver.Text);
lststring.Add(txtCc.Text);
lststring.Add(txtBcc.Text);

MailAddressCollection collection = new MailAddressCollection();

collection.Add(new MailAddress(txtReceiver.Text));

not sure whether it will use one address or many addresses, if required many addresses, it may required list collection, but the list collecton could not be enter to collection.Add,
therefore, tried the single address, as stated in other forum, but the error is still there

Hiran Desai

Your mail message is type of what?
1) System.Net.Mail.MailMessage
2) System.Web.Mail.MailMessage

doramail05

ASKER

previously used 2)

now use 1) after reading forums, for testing

doramail05

ASKER

source file destinaton :

http://www.codeproject.com/Articles/10828/Sending-Email-with-attachment-in-ASP-NET-using-SMT

Hiran Desai

Is it reference site or you are pointing to a problem you posted there?

doramail05

ASKER

no, not sure, but i was working on the source file found that,

doramail05

ASKER

just that it could not send the attachment but only the email

error :
System.IO.IOException: The process cannot access the file 'C:..\Websites\SendEmailwithAttachment\timesheet.xlsx' because it is being used by another process.
i guess this works:

eventhough it is checked from the task manager it is not running there,

  
            var smtp = new SmtpClient
            {
                Host = "smtp.gmail.com",
                Port = 587,
                EnableSsl = true,
                DeliveryMethod = SmtpDeliveryMethod.Network,
                UseDefaultCredentials = false,
                Credentials = new NetworkCredential("asdasda@gmail.com", "pwd"),
            };
            using (var message = new MailMessage("asdasd@gmail.com", "asddsasa@gmail.com")
            {
                Subject = "sadsasdaad",
                Body = "assadsadsada",

                

                

            })
            {

             //   string strFileName = null;

                if (inpAttachment2.PostedFile != null)
                {
                    HttpPostedFile attFile = inpAttachment2.PostedFile;
                    int attachFileLength = attFile.ContentLength;
                    if (attachFileLength > 0)
                    {
                        strFileName = Path.GetFileName(inpAttachment2.PostedFile.FileName);
                        inpAttachment2.PostedFile.SaveAs(Server.MapPath(strFileName));

                        Attachment attach = new Attachment(Server.MapPath(strFileName));

                        //MailAttachment attach = new MailAttachment(Server.MapPath(strFileName));
                        message.Attachments.Add(attach);
                        attach.Dispose();
                        //    attach2 = strFileName;
                    }
                }

                smtp.Send(message);
                message.Dispose();

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Hiran Desai

You need to remove memory references to close the file first before trying to access it..

inpAttachment2.PostedFile.SaveAs(Server.MapPath(strFileName));

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inpAttachment2.PostedFile.FileContent.Dispose();

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Attachment attach = new Attachment(Server.MapPath(strFileName));

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Hope this works

doramail05

ASKER

hi there,

notice that there are only, contenttype, contentlength, inputstream, filename, could not really find FileContent

example :

inpAttachment2.PostedFile.InputStream.Dispose();

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doramail05

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doramail05

ASKER

figure out the above code before this causes the problem