How Sort Array List of Different DataType in .NET

<pre> System.Collections.ArrayList aa = new System.Collections.ArrayList();
           aa.Add(8.9D);
           aa.Add("Hello");
           aa.Add(1.2);
           aa.Add(2);
           aa.Add(4.5);
           aa.Add("ABC");
           //Before 
           foreach (object obj in aa)
           {
               Console.WriteLine(obj.ToString());
              

           }
           aa.Sort();
           //After
           foreach (object obj in aa)
           {
               Console.WriteLine(obj.ToString());


           }