WCF DataService with Custom Function and parameter

namespace Senthamil.Sample

    public class PORSS : DataService<ModelEntities>
        // This method is called only once to initialize service-wide policies.
        public static void InitializeService(DataServiceConfiguration config)
            // TODO: set rules to indicate which entity sets and service operations are visible, updatable, etc.
            // Examples:
            config.SetEntitySetAccessRule(“RSS_STATUS”, EntitySetRights.AllRead);
            config.SetServiceOperationAccessRule(“MyFunction”, ServiceOperationRights.All);
            config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2;

        public IQueryable<RSS_STATUS> MyFunction(string RefNumb)
            ModelEntities MySource = new ModelEntities();
            return from c in MySource.RSS_STATUS
                   where c.SUB_SYSTEM_NUMBER == RefNumb
                   select c;

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