internal Attachment GetAttachment()
{
var saa = new Attachment(_contentStream, _name);
saa.ContentId = _contentId;
_contentDisposition.SetContentDisposition(saa.ContentDisposition);
saa.ContentType = _contentType.GetContentType();
saa.Name = _name;
saa.TransferEncoding = _transferEncoding;
saa.NameEncoding = _nameEncoding;
return saa;
}