Just found this class while looking for a automatically alphabetically sorted-by-key hashtable (from http://msdn.microsoft.com/en-us/library/system.collections.sortedlist.aspx):

using System;

using System.Collections;

public class SamplesSortedList  {


   public static void Main()  {


      // Creates and initializes a new SortedList.

      SortedList slides = new SortedList();

      slides.Add("0", "slide1");

      slides.Add("2", "slide3");

      slides.Add("1", "slide2");


      // Displays the properties and values of the SortedList.

      for (int i = 0; i < slides.Count; i++)  {

         Console.WriteLine("{0}:{1}", slides.GetKey(i), slides.GetByIndex(i));

      }

      Console.WriteLine();

}