This property is provided as a convenience for developers to annotate (or "tag") individual Toolbar items with arbitrary data objects during the processing of an HTTP request.
If the Tag object is a Common Language Runtime (CLR) reference-type, then developers are encouraged to implement ICloneable on its type to properly support deep copies made by the Clone method.
In order for the Tag object to persist itself within viewstate across postbacks, it must either be marked with the Serializable attribute, or implement ISerializable. Please consult the .NET Framework SDK for more information on serialization.
Target Platforms: Windows 10, Windows 8.1, Windows 8, 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