How to delete global and local option set from MS CRM using C#

DeleteOptionValueRequest localoptionset = new DeleteOptionValueRequest

            {

                EntityLogicalName = "productpricelevel",

                AttributeLogicalName = "quantitysellingcode",

               // OptionSetName = "quantitysellingcode",

                Value = 100000001

            };

            _service.Execute(localoptionset);