Display label of option set based on value

 Dynamics 365 Optionset label display using Javascript

string GlobaloptionsetText = GetCRMOptionSetLabel(service, entity.LogicalName, "new_rating", irating);

   private string GetCRMOptionSetLabel(IOrganizationService service, string entityname, string optionsetname, int value)

        {

            Microsoft.Xrm.Sdk.Messages.RetrieveAttributeRequest reqOptionSet = new Microsoft.Xrm.Sdk.Messages.RetrieveAttributeRequest();

            reqOptionSet.EntityLogicalName = entityname;

            reqOptionSet.LogicalName = optionsetname;

            Microsoft.Xrm.Sdk.Messages.RetrieveAttributeResponse resp = (Microsoft.Xrm.Sdk.Messages.RetrieveAttributeResponse)service.Execute(reqOptionSet);

            Microsoft.Xrm.Sdk.Metadata.PicklistAttributeMetadata opdata = (Microsoft.Xrm.Sdk.Metadata.PicklistAttributeMetadata)resp.AttributeMetadata;

            var option = opdata.OptionSet.Options.FirstOrDefault(o => o.Value == value);

            return option.Label.LocalizedLabels.FirstOrDefault().Label;

        }