public virtual bool BeforeUpdate(
	EntryEvent<TKey, TValue> ev
)

Public Overridable Function BeforeUpdate ( 
	ev As EntryEvent(Of TKey, TValue)
) As Boolean

public:
virtual bool BeforeUpdate(
	EntryEvent<TKey, TValue>^ ev
)

abstract BeforeUpdate : 
        ev : EntryEvent<'TKey, 'TValue> -> bool 
override BeforeUpdate : 
        ev : EntryEvent<'TKey, 'TValue> -> bool