This property contains the denied permission, permission set, or permission set collection that caused the security check to fail. It is a null reference (Nothing in Visual Basic) for exceptions that are not caused by a Deny. The property is of type Object because it can contain a permission, a permission set, or a permission set collection. To test the run-time type of this property, you can use the GetType method or a specific language operator, such as the is operator in C# or the TypeOf operator in Visual Basic.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)