Recursive call return a List, return type causing me issues

Question

I have a recursive method that is return me categories, and checking for its sub categories.

So it looks like:

public List GetAllChildCat         


        

Answer 1

   foreach(Category cat in c.ChildCategories)
      {
              list.AddRange( GetAllChildCats(cat.CategoryID) )

      }

and don't forget the

return list;