ascending/descending in LINQ - can one change the order via parameter?

Question

I have a method which is given the parameter \"bool sortAscending\". Now I want to use LINQ to create sorted list depending on this parameter. I got then this:

Answer 1

What about ordering desc by the desired property,

   blah = blah.OrderByDescending(x => x.Property);

And then doing something like

  if (!descending)
  {
       blah = blah.Reverse()
  }
  else
  {
      // Already sorted desc ;)
  }

Is it Reverse() too slow?