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I try to Lazy< SelectList > for lazy caching any lookup data in my ASP.NET MVC project. But I cannot force Lazy object to reload lookup data when it is changed. I create derived class like the following code. I found that Lazy< T > use IsValueCreated property to keep current state. However, in MappingFunc method I cannot change value of IsValueCreated because it is static method. public class LazySelectList : Lazy<SelectList> { public LazySelectList(Func<LimeEntities, IEnumerable> initFn, string dataValueField, string dataTextField) : base(MapingFunc(initFn, dataValueField, dataTextField)) { } public new bool IsValueCreated { get; set; } public static Func<SelectList> MapingFunc(Func<DbContext, IEnumerable> valueFactory, string dataValueField, string dataTextField) { return () => { var context = ObjectFactory.GetInstance<DbContext>(); return new SelectList(valueFactory(context), dataValueField, dataTextField); }; } } I use the below code the call this function. But it always creates new value because IsValueCreated value is always false. LookupCache.DocTypeList = new LazySelectList(db => db.DocTypes.OrderBy(x => x.Name), "ID", "Name");

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