If the height and/or width properties are set to a neutral values (less than 0), this method returns an appropriate size for the box by measuring the string to be displayed in the box, using the font specified in the TextStyle.
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