I have a nested data object for a set of items within categories. Each category can contain sub categories and there is no set limit to the depth of sub categories. (A file system would have a similar structure.) It looks something like this:

class category
{
    public int id;
    public string name;
    public IQueryable<category> categories;
    public IQueryable<item> items;
}
class item
{
    public int id;
    public string name;
}

I am passing a list of categories to my view as IQueryable<category>. I want to output the categories as a set of nested unordered list (<ul>) blocks. I could nest foreach loops, but then the depth of sub categories would be limited by the number of nested foreach blocks. In WinForms, I have done similar processing using recursion to populate a TreeView, but I haven't seen any examples of using recursion within an ASPX MVC view.

Can recursion be done within an ASPX view? Are there other view engines that include recursion for view output?