Desenhando um quadrado no AutoCAD com ObjectARX: Parte I

Post3-4.cs

            var document = Application.DocumentManager.MdiActiveDocument;

            using (var transaction = document.TransactionManager.StartTransaction())
            {
                var blockTable = transaction.GetObject(document.Database.BlockTableId, OpenMode.ForRead) as BlockTable;
                var blockTableRecord = transaction.GetObject(blockTable[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord;                
            }