为什么我这里的开始按钮的功能会没有作用啊？？？
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Threading;

namespace WindowsApplication14
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Label label1;
private System.Threading.Thread thread1;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.label1 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(24, 184);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(80, 32);
this.button1.TabIndex = 0;
this.button1.Text = "开始";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// button2
//
this.button2.Location = new System.Drawing.Point(168, 184);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(80, 32);
this.button2.TabIndex = 1;
this.button2.Text = "停止";
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// label1
//
this.label1.Location = new System.Drawing.Point(72, 48);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(144, 80);
this.label1.TabIndex = 2;
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.label1);
this.Controls.Add(this.button2);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void button1_Click(object sender, System.EventArgs e)
{
try
{
if (thread1.ThreadState == ThreadState.Suspended || thread1.ThreadState == ThreadState.SuspendRequested ||
thread1.ThreadState == ThreadState.WaitSleepJoin)
{

thread1.Resume();
}
}
catch(Exception te)
{
MessageBox.Show(te.Message);
}
}

private void button2_Click(object sender, System.EventArgs e)
{
try
{
if (thread1.ThreadState == ThreadState.Running || thread1.ThreadState == ThreadState.WaitSleepJoin)
{

thread1.Suspend();
}
}
catch(Exception te)
{
MessageBox.Show(te.Message);
}
}

public void Run()
{
Random num = new Random();
do
{
int a = num.Next(100);
this.label1.Text = a.ToString();
Thread.Sleep(10);
}
while(true);
}

private void Form1_Load(object sender, System.EventArgs e)
{
thread1 = new Thread(new ThreadStart(Run));
thread1.Start();
}
}
}