.NET Framework 4.6 and 4.5
Forces the control to invalidate its client area and immediately redraw itself and any child controls.
virtual void Refresh()
Notes to Inheritors
When overriding Refresh in a derived class, be sure to call the base class's Refresh method so the control and its child controls are invalidated and redrawn.
Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
.NET Framework Client Profile
Supported in: 4, 3.5 SP1