Note: This method checks the collection for the specific instance of the object that is provided. It does not check the collection for an object with a particular key. If this collection is a KeyedSubObjectsCollectionBase then you can use the KeyedSubObjectsCollectionBase.Exists method to see if an item exists in the collection with the specified key.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2