Public ReadOnly Property OldValue As T

Dim instance As PropertyChangedEventArgs(Of T)
Dim value As T
 
value = instance.OldValue

public T OldValue {get;}

public read-only property OldValue: T; 

public function get OldValue : T

public: __property T* get_OldValue();

public:
property T^ OldValue {
   T^ get();
}