Returns the number of members in the set.
Original signature is '- (NSUInteger)count'
Available in Mac OS X v10.0 and later.

C# | Visual Basic | Visual C++ |
public virtual NSUInteger Count { get; }
Public Overridable ReadOnly Property Count As NSUInteger Get
public: virtual property NSUInteger Count { NSUInteger get (); }

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)