C# Signature:

[DllImport("user32.dll")]
static extern bool InvalidateRgn(IntPtr hWnd, IntPtr hRgn, bool bErase);

User-Defined Types:

None.

Notes:

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Tips & Tricks:

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Sample Code:

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Alternative Managed API:

Invalidate() method

Invalidate() - invalidates the entire surface causing the control to be repainted.
Invalidate(bool invalidateChilden) - Optionally, invalidates the child controls assigned to the control.
Invalidate(Rectangle rect) - Adds the specified rectangle to the update region of the control and causes a paint message to be sent to the control.
Invalidate(Rectangle rect, bool invalidateChildern) - combination of the previous two.
Invalidate(Region rgn) - Adds the specified graphics region to the update region of the control and causes a paint message to be sent to the control.
Invalidate(Region rgn, bool invalidateChildren)

Control.Invalidate(), Form1.Invalidate(), this.Invalidate(), Me.Invalidate()

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