Get and thenDelete item in top of list

If by 'top' you mean the first item in the List, then try this short program:

using System;
using System.Collections.Generic;

class Test
{
   static void Main()
   {
       List names = new List();
       names.Add("Sergio");
       names.Add("Mark");
       names.Add("David");
       names.Add("Alan");
       Console.Clear();
       Console.WriteLine("Original list :\n");
       foreach(string name in names)
       {
          Console.WriteLine(name);
       } 
       // Get first item, display and delete it
       string first = names[0];
       Console.WriteLine("\nFirst name is {0}", first);
       names.RemoveAt(0);
       Console.WriteLine("\nRevised list :\n");
       foreach(string name in names)
       {
          Console.WriteLine(name);
       }
       Console.ReadKey();
   }
} 

To get and delete the last item in the List replace 0 in the names indexer and RemoveAt() method with names.Count - 1.