How can i sort DESC and ASC in list generic?

Question

How can I sort DESC and ASC in a generic list? With LINQ and without LINQ ? I'm using vs 2008.

   class Program
    {
        static void Main(string[] args)
        {
            List<int> li = new List<int>();
            li.Add(456);
            li.Add(123);
            li.Add(12345667);
            li.Add(0);
            li.Add(1);
            li.Sort();
            foreach (int item in li)
            {
                Console.WriteLine(item.ToString()+"\n");
            }

            Console.ReadKey();
        }
    }

Answer 1

With Linq

var ascendingOrder = li.OrderBy(i => i);
var descendingOrder = li.OrderByDescending(i => i);

Without Linq

li.Sort((a, b) => a.CompareTo(b)); // ascending sort
li.Sort((a, b) => -1* a.CompareTo(b)); // descending sort

Note that without Linq, the list itself is being sorted. With Linq, you're getting an ordered enumerable of the list but the list itself hasn't changed. If you want to mutate the list, you would change the Linq methods to something like

li = li.OrderBy(i => i).ToList();

Answer 2

with out linq, use Sort() and then Reverse() it.

Answer 3

Without Linq:

Ascending:

li.Sort();

Descending:

li.Sort();
li.Reverse();

Answer 4

You can implement Comparison method. http://msdn.microsoft.com/en-us/library/w56d4y5z.aspx