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BitmapData has a property called Reserved, which returns a 32-bit signed integer. Microsoft’s documentation says not to use this property. If we shouldn’t use it; then why is it there? What exactly is it for?
Reserved fields and properties can have a variety of uses. One fairly common usage is to allow for the possibility that more sophisticated types of BitmapData may in future need to store some type of information for which the present structure makes no provision. If nobody has used the Reserved field for anything, future implementations could use that field to hold a pointer or handle to another structure containing additional information.