How to know if the Scroll is up to maximum value

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C#

I create a SplitContainer in my Main Form, and write code for it as below. Of course, I also have implemeted some controls inside the SplitContainer, and they can be moved without problem.

SplitContainer TheSC = new SplitContainer();
TheSC.Panel1.AutoScroll = true;
TheSC.Panel1.Scroll += new ScrollEventHandler(Panel1_Scroll);
        
void Panel1_Scroll(object sender, ScrollEventArgs e)
{
  Panel ThePanel = (Panel)sender;
  int CheckValue1 = e.NewValue;
  int CheckValue2 = e.OldValue;
  Type TheType = e.GetType();
  if (e.ScrollOrientation == ScrollOrientation.HorizontalScroll) { }

}

My question is :

When I move control to edge of TheSC, the scrollbar will be displayed, and then I
draw the scrollbar of TheSC.Panel1, the Panel1_Scroll event should be invoked, in the event, how can I know if the scrollbar has been up to maximum value ? (I would set some flag when the scrollbar is up to maximum value.)