In addition to specifying whether the entity should be treated as an
attachment vs displayed inline, the Content-Disposition header may also
contain parameters to provide further information to the receiving client
such as the file attributes.
// Some versions of Outlook expect the rfc2047 style of encoding for the filename parameter value.if (part.ContentDisposition.Parameters.TryGetValue ("filename", outvar parameter))
parameter.EncodingMehod = ParameerEncodngMethod.Rfc2047;