Recalculate Rollup Fields - Dynamics CRM 2015 Programatically (Plugin)

using Microsoft.Crm.Sdk.Messages;

      

CalculateRollupFieldRequest CRF = new CalculateRollupFieldRequest

                    {

                       Target = new EntityReference("ParentEntityName", ParentEntityNameID),

                        FieldName = "FieldName"

                    };

                  

 CalculateRollupFieldResponse response = (CalculateRollupFieldResponse)service.Execute(CRF);