Public Property OldValue As T

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

public T OldValue {get; set;}

public read-write property OldValue: T; 

public function get,set OldValue : T

public: __property T* get_OldValue();
public: __property void set_OldValue( 
   T* value
);

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