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Control.Invalidate Method (Region)

.NET Framework 1.1

Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control.

[Visual Basic]
Overloads Public Sub Invalidate( _
   ByVal region As Region _
public void Invalidate(
 Region region
public: void Invalidate(
 Region* region
public function Invalidate(
   region : Region


The Region to invalidate.


Calling the Invalidate method does not force a synchronous paint; to force a synchronous paint, call the Update method after calling the Invalidate method. When this method is called with no parameters, the entire client area is added to the update region.


Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

Control Class | Control Members | System.Windows.Forms Namespace | Control.Invalidate Overload List | Refresh | Update