This .NET class wraps the AcTransaction ObjectARX class. 

Transactions provide a way to extend the boundary of operation on an object beyond open and close, and avoid those vexing open conflict errors. They also improve performance by being lenient on multiple open requests while postponing all the opened objects close-time work to the end of the transaction.

Autodesk.AutoCAD.DatabaseServices.Transaction
    Autodesk.AutoCAD.DatabaseServices.OpenCloseTransaction

Public Class Transaction
Inherits RXObject

public class Transaction : RXObject;