i am displaying version(WrmVersion) value in a listview ,,but here i given one codition means if version(WrmVersion) is null i am displaying \'None\'(ResourcePolicyAvailSystems
You can't add:
ResourcePolicyAvailSystemsLVI.m_nullString
because the scope of that member is either private or internal.
You need to make it public (or ideally, expose it via a property).