Gets the string representation for the System.Web.UI.WebControls.PolygonHotSpot object's shape.
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The PolygonHotSpot.MarkupName property is used internally by ASP.NET to get the markup-language string representation for the shape of the System.Web.UI.WebControls.PolygonHotSpot object. This property always returns the string "poly". You cannot access this property directly from your application's code.