NotOverridable (Visual Basic)
Specifies that a property or procedure cannot be overridden in a derived class.
Remarks
The NotOverridable
modifier prevents a property or method from being overridden in a derived class. The Overridable modifier allows a property or method in a class to be overridden in a derived class. For more information, see Inheritance Basics.
If the Overridable
or NotOverridable
modifier is not specified, the default setting depends on whether the property or method overrides a base class property or method. If the property or method overrides a base class property or method, the default setting is Overridable
; otherwise, it is NotOverridable
.
An element that cannot be overridden is sometimes called a sealed element.
You can use NotOverridable
only in a property or procedure declaration statement. You can specify NotOverridable
only on a property or procedure that overrides another property or procedure, that is, only in combination with Overrides
.
Combined Modifiers
You cannot specify Overridable
or NotOverridable
for a Private
method.
You cannot specify NotOverridable
together with MustOverride
, Overridable
, or Shared
in the same declaration.
Usage
The NotOverridable
modifier can be used in these contexts: