Yield Keyword Usage - Control never passes to the method

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C#

.NET

C#3.5

.NET4

console

I am demoing a Console Application to try out the Yield Keyword. This is my code.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace YieldKeyword
{
    class Program
    {
        static List<int> MyList = new List<int>();

        static void FillValues()
        {
            MyList.Add(1);
            MyList.Add(2);
            MyList.Add(3);
            MyList.Add(4);
            MyList.Add(5);
        }
        static IEnumerable<int> FilterWithoutYield()
        {
            List<int> temp = new List<int>();
            foreach (int i in MyList)
            {
                if (i > 3)
                {
                    temp.Add(i);
                }
            }
            return temp;
        }
        static IEnumerable<int> FilterWithYield()
        {
            foreach (int i in MyList)
            {
                if (i > 3) yield return i;
            }
        } 
        static void Main(string[] args)
        {
            FillValues();
            //IEnumerable<int> temp = new List<int>();
            //temp = FilterWithoutYield();
            FilterWithYield();
            foreach (int i in MyList)
            {
                Console.WriteLine(i);
            }
            Console.ReadLine();
        }
    }
}

However, the control never passes to the

FilterWithYield

method. Why is this happening ? What am I doing wrong ?