public EdiEnvelope(EdiSegmentCollection segs)
{
Header = segs.FirstWith(headerLabel());
Footer = segs.FirstWith(footerLabel());
_footerArray = Footer.GetElements(segs.ElementDelimiter);
_headerArray = Header.GetElements(segs.ElementDelimiter);
if (Header == null || Footer == null)
{
throw new EdiBadlyFormedEnvelopeException("Header/Footer not found in envelope!");
}
ControlNumber = Footer.GetElements(segs.ElementDelimiter)[1];
_segments = segs;
_parseHeader();
_parseFooter();
}