using System;
using System.Threading;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            var sum = 0;
            var eh = new ManualResetEvent(false);
            ThreadPool.QueueUserWorkItem(h =>
            {
                for (var i = 2; i <= 100; i += 2)
                    sum += i;
                eh.Set();
            });
            var sum2 = 0;
            for (var i = 1; i <= 100; i += 2)
                sum2 += i;
            eh.WaitOne();
            Console.WriteLine("计算结果分别为{0}、{1}，总计为{2}。", sum2, sum, sum2 + sum);
            Console.ReadKey();
        }


    }
}

------解决方案--------------------
http://www.cnblogs.com/xugang/archive/2008/04/06/1138856.html

------解决方案--------------------
如果有可能升级下.net版本吧
可以看看下面的文章或者blog:
Parallel Programming in the .NET Framework
http://msdn.microsoft.com/en-us/library/dd460693(v=vs.100).aspx

Parallel Computing
http://msdn.microsoft.com/en-us/vstudio/bb964701.aspx


Parallel Programming with .NET
http://blogs.msdn.com/b/pfxteam/