When overridden in a derived class, gets the string representation for the System.Web.UI.WebControls.HotSpot object's shape.
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The HotSpot.MarkupName member is used primarily by control developers when deriving a custom implementation from the System.Web.UI.WebControls.HotSpot class.
When overridden in a derived class, the HotSpot.MarkupName property gets a string that represents the name of the System.Web.UI.WebControls.HotSpot object's shape.