I have create SectionView from to code below:
ObjectId _o = SectionView.Create(l.ToString(), _id, _3d);
SectionView sect = tr.GetObject(_o, OpenMode.ForWrite) as SectionView;
ObjectId _band = _doc.Styles.SectionViewBandSetStyles[_Band];
sect.Bands.ImportBandSetStyle(_band);
SectionViewBandSet _set = sect.Bands;
But when i select Change Band Set so appear message box must to choose Band Set and then i have choose style Band Set style but program automatic close. I don't know make it how to do that, so can eyverybody help me, Please. I have send File below:

