When you mark a class with this attribute, you tell the code generator to create an extender property with the name you provide. The marked class must implement System.ComponentModel.IExtenderProvider. As a result, the new property can be used by other components in a container.

Within the marked class, you must implement Get <name> and Set <name> methods. For example, if you mark a class with [ProvideProperty("PropertyName")], you must implement GetPropertyName and SetPropertyName methods. To specify that the new property will be an extender property, you must implement from System.ComponentModel.IExtenderProvider, you must also implement a CanExtend method.

For more information, see Extending Metadata Using Attributes.