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Control.Invalidate Method (Region, Boolean)

.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. Optionally, invalidates the child controls assigned to the control.

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


The Region to invalidate.
true to invalidate the control's child controls; otherwise, false.


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