What does the ? mean in this line of code

I'm trying to decipher the meaning in this code. The ? is confusing me.

HighPage = (CurrentCoursePage > HighPage) ? CurrentCoursePage : HighPage;

Any help would be greatly appreciated!

It's using the ternary operator (google it).
This:

HighPage = (CurrentCoursePage > HighPage) ? CurrentCoursePage : HighPage;

Means:
If the CurrentCoursePage is greater than the HighPage then HighPage = CurrentCoursePage else HighPage = HighPage.

It's a short way of saying:

if(CurrentCoursePage > HighPage)
{
HighPage = CurrentCoursePage;
}
else
{
HighPage = HighPage;
}



Good luck;

could be used also like this:
condition?statement(or function):statement(or function);

and could be used without else{}
condition?statement(or function):null;