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The ContentDisposition.ModificationDate property is used to send time stamp information with a file being sent in an e-mail message. This value sets the Modification-Date parameter in the Content-Disposition header sent with the e-mail message.
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 the ContentDisposition.ModificationDate property, get the System.Net.Mime.ContentDisposition for the attachment using the System.Net.Mail.Attachment.ContentDisposition property.
The Content-Disposition header is described in RFC 2183 available at tp://www.ietf.org/.