Collections Data Structure C#

//The MIT License (MIT)
//http://arolibraries.codeplex.com/license
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading;
namespace AroLibraries.ExtensionMethods.Enumerable
{
    public static class IEnumerableExt
    {
        public static IEnumerable Ext_Repeat(this IEnumerable source, int count, bool onEndOfCollection)
        {
            if (count < 0)
            {
                throw new ArgumentOutOfRangeException("count");
            }
            if (onEndOfCollection)
            {
                for (int i = 0; i < count; i++)
                {
                    foreach (TResult result in source)
                    {
                        yield return result;
                    }
                }
            } else {
                foreach (TResult result in source)
                {
                    for (int i = 0; i < count; i++)
                    {
                        yield return result;
                    }
                }
            }
        }
   }
}