Sending an attachment that the user chose with mail

Question

The problem:

I want that users can send me mails with attachments. They can choose the file with an input file button in html. The problem is that i

Answer 1

Below a complete example to add files to an email message as attachment without writing them to the disk.

using (SmtpClient client = new SmtpClient())
using (MailMessage message = new MailMessage())
{
    client.Host = "host.com";
    client.Port = 25;
    client.Timeout = 10000;
    client.EnableSsl = false;
    client.DeliveryMethod = SmtpDeliveryMethod.Network;
    client.UseDefaultCredentials = false;
    client.Credentials = new NetworkCredential("user", "pass");

    message.From = new MailAddress("email@from.nl", "VDWWD");
    message.To.Add(new MailAddress("email@to.nl"));
    message.Subject = "Your uploaded files";
    message.IsBodyHtml = true;
    message.Body = "The files you uploaded.";

    //loop all the uploaded files
    foreach (var file in FileUpload1.PostedFiles)
    {
        //add the file from the fileupload as an attachment
        message.Attachments.Add(new Attachment(file.InputStream, file.FileName, MediaTypeNames.Application.Octet));
    }

    //send mail
    try
    {
        client.Send(message);
    }
    catch (Exception ex)
    {
        //handle error
    }
}