Get email attachment size in asp.net

Is there any way to know the size of the attachment that is being sent in an email in asp.net c#?

thanks!

If you're using System.Net.Mail and attaching the file via the Attachment class, then each attachment should have a ContentStream property containing the actual file. This property, of type Stream, has a Length property (of type long) which gives the size of the file in bytes.

Typically attachments are base64 encoded in System.Net.Mail. base64 encoding takes 3 bytes, and converts them to 4 bytes.

What you need to do, is determine the length of the attachment (either as Stream.Length, the byte[] length, or the File length), and divide it by .75.

This will give you the size of the attachment, base64 encoded for SMTP.

I believe u can use HttpFileCollection class. It gives you access to all the files uploaded by client. Here is the msdn link

Attachment.ContentDisposition.Size will give the attachment size (in bytes)

string smtpClientHost = "mymailsender.example.com";
string emailAddressFrom = "noreply@example.com";

MailMessage mailMessage = new MailMessage {
  From = new MailAddress(strEmailAddressFrom)
};

mailMessage.To.Add(new MailAddress("examplerecipient@anotherdomain.com"));

mailMessage.Body = "Email body content here...";

mailMessage.Subject = "An important subject...";

foreach(var attachment in attachments)
    if (attachment.ContentDisposition.Size < ByteSize.FromMegaBytes(1).Bytes) 
        mailMessage.Attachments.Add(attachment);

SmtpClient smtpClient = new SmtpClient(strSmtpClientHost);

smtpClient.Send(mailMessage);