If both AllowCellNavigation and AllowCellNavigation are false then it is not possible to have a current cell and CurrentCell will return a null reference (Nothing in Visual Basic).
Only cells whose CanBeCurrent property is set to true can be current.
Target Platforms: 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