程序代码：

      
namespace Thread
{
    public partial class Thread : Form
    {
        public Thread()
        {
            InitializeComponent();
        }

//=================================以下部分为两个线程(Add,,Div)所要做的事======================================
        public static void Add()
        {
            int sum = 0;
            for (int i = 1; i <= 100; i++)
            {
                sum += i;
                Console.WriteLine("Addtion:i=" + i + "   sun=" + sum);
            }
        }

       
        public static void Div()
        {
            int sum = 5050;

            for (int i = 1; i <= 100; i++)
            {
                sum -= i;
                Console.WriteLine("Divistion:i=" + i + "   sum=" + sum);
            }
        }


 //=================================以上部分为两个线程的运算===============================      
        

//=================================以下为出错部分=======================================

       private void Thread_Load(object sender, EventArgs e)
        {
            Thread Add = new Thread(new ThreadStart(Add));
            /*错误1    “Add”是“变量”，但此处被当做“方法”来使用
            错误    2 “Thread.Thread”不包含采用“1”个参数的构造函数   
             */
           
            Thread Div = new Thread(new ThreadStart(Div));
            /*错误3    “Div”是“变量”，但此处被当做“方法”来使用
            错误    4    “Thread.Thread”不包含采用“1”个参数的构造函数
             */
        }

        private void Start_Click(object sender, EventArgs e)
        {
            try
            {
                Add.Start();//错误5 “Thread.Thread.Add()”是一个“方法”，这在给定的上下文中无效

                Div.Start();//错误6 “Thread.Thread.Div()”是一个“方法”，这在给定的上下文中无效

            }
           
            catch (ThreadStateException)
            {
                Console.WriteLine("The thread has alread been startsd.");
            }
        }
//=====================================以上为出错部分===================================
  
     }

}

程序代码：

//补充:::::::

private void Thread_Load(object sender, EventArgs e)//"Thread"为窗体的name

private void Start_Click(object sender, EventArgs e)//"Start"为一个按钮的name

程序代码：

using System;
using System.Collections.Generic;
using using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace Thread_Example
{
    public partial class Form1 : Form
    {
       
        public Form1()
        {
            InitializeComponent();
        }

        //=================================以下部分为两个线程(Add,,Div)所要做的事======================================
        public static void Addition()
        {
            int sum = 0;
            for (int i = 1; i <= 100; i++)
            {
                sum += i;
                Console.WriteLine("Addtion:i=" + i + "   sun=" + sum);
            }
        }


        public static void Division()
        {
            int sum = 5050;

            for (int i = 1; i <= 100; i++)
            {
                sum -= i;
                Console.WriteLine("Divistion:i=" + i + "   sum=" + sum);
            }
        }

        //=================================以上部分为两个线程的运算===============================      


       

        private void Form1_Load_1(object sender, EventArgs e)
        {
            Thread AddThread = new Thread(new ThreadStart(Addition));
           
            Thread DivThread = new Thread(new ThreadStart(Division));
         
        }
  //=================================以下为出错部分=======================================
        private void Start_Click_1(object sender, EventArgs e)
        {
          
            try
            {
                AddThread.Start(); //错误1:当前上下文中不存在名称“AddThread”

                DivThread.Start();//错误2:当前上下文中不存在名称“DivThread”

            }

            catch (ThreadStateException)
            {
                Console.WriteLine("The thread has alread been startsd.");
            }
        }

        //=====================================以上为出错部分===============================
    }
}