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.
Syntax
public void Invalidate (System.Drawing.Region region)
Parameters
- region
Remarks
Calling the Control.Invalidate(System.Drawing.Region) method does not force a synchronous paint; to force a synchronous paint, call the Control.Update method after calling the Control.Invalidate(System.Drawing.Region) method. When this method is called with no parameters, the entire client area is added to the update region.
Requirements
Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0