// this program is the program on page 112 C#4 Wrox  --- 27/11/2012
// it deals with the creation of a generic linkedlist-
using System;
using System.Collections.Generic ;
using System.Linq;
using System.Text;

namespace scratch_pad_2
{
    class Program
    {

        static void Main(string[] args)
        {
            var list1 = new LinkedList<int>();
            list1.AddLast(1);
            list1.AddLast(2);
            list1.AddLast(3);
            foreach (int i in list1)
            {
                Console.WriteLine(i);
                Console.Read();
            }
        }
    }

    public class LinkedListNode<int> 
    {
        public LinkedListNode(int  value)
        {
            this.Value = value;
        }
        public int  Value { get; private set; }
      

        public LinkedListNode<int> Next { get; internal set; }
        public LinkedListNode<int> Prev { get; internal set; }
    }
    public class LinkedList<int> : IEnumerable<int> // please see the int is Black , // which should not be.
    {
        public LinkedListNode<int> First { get; private set; }
        public LinkedListNode<int> Last { get; private set; }
        public LinkedListNode<int> AddLast(int  node)
        {
            var newNode = new LinkedListNode<int>(node);
            if (First == null) { First = newNode; Last = First; }
            else
            { Last.Next = newNode; Last = newNode; }
            return newNode;        
        }
        public IEnumerator<int> GetEnumerator() 
        {
            LinkedListNode<int> current = First;
            
            while (current != null) { yield return current.Value;
            current = current.Next;
            }
        }
              

    }
}

The error message that comes is 
Error	1	Type parameter declaration must be an identifier not a type	C:\Users\lenovo\documents\visual studio 2010\Projects\scratch pad 2\Program.cs	28	33	scratch pad 2