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The ContentDisposition.CreationDate property is used to send time stamp information with a file being sent in an e-mail message. This value sets the Creation-Date parameter in the Content-Disposition header sent with the email.
The System.Net.Mail.MailMessage class is used to compose an e-mail message. The System.Net.Mail.Attachment class is used to attach a file to an e-mail message. To set ContentDisposition.CreationDate, get the System.Net.Mime.ContentDisposition for the attachment from the System.Net.Mail.Attachment.ContentDisposition property.
The Content-Disposition header is described in RFC 2183 available at tp://www.ietf.org/.