string names = "";
CAD_APS.Document doc = CAD_APS.Application.DocumentManager.MdiActiveDocument;
Database db = HostApplicationServices.WorkingDatabase;
using (Transaction tr = db.TransactionManager.StartTransaction())
{
BlockTableRecord btRecord = (BlockTableRecord)tr.GetObject(SymbolUtilityServices.GetBlockModelSpaceId(db), OpenMode.ForRead);
foreach (ObjectId id in btRecord)
{
CAD_DBS.Entity ent = (CAD_DBS.Entity)tr.GetObject(id, OpenMode.ForRead);
if (ent is CIV_DBS.Label)
names += (ent as CIV_DBS.Label).Name + '\n';
}
tr.Commit();
}