//Init the class only do this one time
AC_Transactions tr = new AC_Transactions();
Entity ent = tr.openObject(myid,OpenMode.ForRead) as Entity;

// Start a transaction 
using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction()) { 
	// Open the Block table for read 
	BlockTable acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,OpenMode.ForRead)as BlockTable;  
	// Open the Block table record Model space for read 
	BlockTableRecord acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],OpenMode.ForRead) as BlockTableRecord;  
	// Step through the Block table record 
	foreach (ObjectId asObjId in acBlkTblRec) 
	{
	//IF the id that we have is equal to and id in the BlockTableRecord acBlkTblRec open the object
	  if(myid == asObjId)
	  {
	    Entity ent = acTrans.GetObject(asObjId,Openmode.ForRead) as Entity;
	  }
	}  
// Dispose of the transaction
}

//Init the class only do this one time
AC_Transactions tr = new AC_Transactions();
// Start a transaction
tr.start_Transaction();
// Open the Block tables for read
openBlockTables(OpenMode.ForRead, OpenMode.ForRead);
foreach(Object id in AC_blockTableRecord)
{
  if(myid == id)
  {
    Entity ent = AC_Tr.GetObject(id,mode) as Entity;
  }
}
// Dispose of the transaction
tr.Dispose();