protected virtual DataSet DoNSet(ActiveAssociation assoc, IDimse request, IDicomCommand rspCmd)
 {
     request.ReadDataset(); // read out DataSet, if any
     throw defEx;
 }
 protected virtual void DoCStore(ActiveAssociation activeAssociation, IDimse request, IDicomCommand responseCommand)
 {
     request.ReadDataset(); // read out DataSet, if any
     throw defEx;
 }