Closing an opportunity Programmatically

Entity opptyCloseObj = new Entity("opportunityclose");

opptyCloseObj.Attributes.Add("opportunityid", new EntityReference("opportunity", OpptyID)); opptyCloseObj.Attributes.Add("actualend", DateTime.Now);
opptyCloseObj.Attributes.Add("actualrevenue", ActualopptyAmount);


 var lostOpportunity = new LoseOpportunityRequest
 {
      OpportunityClose = opptyCloseObj,
      Status = new OptionSetValue(MIGRATED_STATUS_CODE) // Expired
 };
                                
ServiceObj.Execute(lostOpportunity);