Lost Methods??

Question

hey, does anyone know why, when you look up the documentation of a class in the compact framework that sometimes the method/property listed in the documentation isn't actually available to you.I have filtering on to the .Net compact framework in visual studio but i am still seeing these unavailable messages. Also im noticing that if i use an object e.g. SqlDataReader that some of it's methods/properties are unavailable in a DLL library but are available in a form e.g. the Item property. Can anyone explain how to solve either of these issues? Thanks