If you are looking for a code to get all the users for a particular business unit, you can use below code private EntityCollection RetrieveUserBasedOnBusinessUnit(IOrganizationService _CrmService,Guid BUId)        {            QueryExpression _Query = new QueryExpression                   {                       EntityName = “systemuser”,                       ColumnSet = new ColumnSet(true),                       Criteria =                       {                          Conditions =                        {                            new ConditionExpression                            {                                AttributeName=”businessunitid”,                                Operator=ConditionOperator.Equal,                                Values={BUId}                             }                        }                       }                   };            return _CrmService.RetrieveMultiple(_Query);       … Read more »