public virtual void NotifyErrorsChanged(
	string propertyName = null
)

Public Overridable Sub NotifyErrorsChanged ( 
	Optional propertyName As String = Nothing
)

public:
virtual void NotifyErrorsChanged(
	String^ propertyName = nullptr
)

abstract NotifyErrorsChanged : 
        ?propertyName : string 
(* Defaults:
        let _propertyName = defaultArg propertyName null
*)
-> unit 
override NotifyErrorsChanged : 
        ?propertyName : string 
(* Defaults:
        let _propertyName = defaultArg propertyName null
*)
-> unit