C#

---

"When the only tool you have is a hammer, a sore thumb you will have."

[Browsable(false),
DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public bool FreezePainting 
{
	get {return mFreezePainting > 0;}

	set 
	{
		if (value & base.IsHandleCreated & base.Visible)
		{
			if (mFreezePainting == 0)
			{
				User32.SendMessage(base.Handle, Constants.WM_SETREDRAW, 0, 0);
			}
			mFreezePainting++;
		}
		if (!value)
		{
			if (mFreezePainting > 0)
			{
				if (mFreezePainting == 1) 
				{
					FreezePaintingEnd();
				}
				else
				{
					mFreezePainting--;
				}
			}
		}
	}
}

int mFreezePainting;

private void FreezePaintingEnd()
{
	if (mFreezePainting > 0)
	{
		mFreezePainting = 0;
		User32.SendMessage(base.Handle, Constants.WM_SETREDRAW, 1, 0);
	}
	this.Invalidate(true);
}