Invalidate Method (Region, Boolean)

Control.Invalidate Method (Region, Boolean)


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.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public void Invalidate(
	Region region,
	bool invalidateChildren


Type: System.Drawing.Region

The Region to invalidate.

Type: System.Boolean

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.

.NET Framework
Available since 1.1
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