The presence of this attribute on a property of a subclass of TargetControlPropertiesBase indicates that the property value is required and the control can not be used without it. Absence of a required property value causes an exception to be thrown during creation of the control.

public sealed class RequiredPropertyAttribute : Attribute

Public NotInheritable Class RequiredPropertyAttribute
	Inherits Attribute

public ref class RequiredPropertyAttribute sealed : public Attribute

[<SealedAttribute>]
type RequiredPropertyAttribute =  
    class
        inherit Attribute
    end