c#的线程问题

用静态变量作为一个线程的要提交的变量
我写了个简单的示例
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{

Thread thread1 = new Thread(new ThreadStart(Thread1));
Thread thread2 = new Thread(new ThreadStart(Thread2));
thread1.Start();
while (Threadpara1.isFinish==false)
{}
thread2.Start();

}
public void Thread1()
{
Threadpara1.time = DateTime.Now;
Threadpara1.isFinish = true;
}
public void Thread2()
{
Threadpara2.time = Threadpara1.time.AddSeconds(10);
}
}
public class Threadpara1
{
public static DateTime