generic list Take not working?

This works in my Unity 4.0:

     // C#
     var L = new List<int>();
     for (int i = 0; i < 30; i++)
         L.Add(i);
     foreach(var val in L.Skip(2).Take(5))
         Debug.Log(val);

This prints :

 2
 3
 4
 5
 6

Are you sure you have a "using System.Linq;" in your script?
(and of course "using System.Collections.Generic;")
Skip / Take and a lot of other functions are Linq extention methods which work on generic IEnumerable. Those functions are not part of the List class, they can be used on any generic collection but only when you "import" them.

edit
Even when they don't exist they are not really hard to implement ;)

 public static IEnumerable<T> Take<T>(this IEnumerable<T> aSource, int aCount)
 {
     foreach(T val in aSource)
     {
        if (aCount >0)
            yield return val;
        else
            yield break;
        aCount--;
     }
 }

 public static IEnumerable<T> Skip<T>(this IEnumerable<T> aSource, int aCount)
 {
     foreach(T val in aSource)
     {
        if (aCount > 0)
        {
            aCount--;
            continue;
        }
        else
            yield return val;
     }
 }

Haven't testet it, but it should work ;) That's the whole magic.