namespace csdn
{
 /// <summary>
 /// WebForm54 的摘要说明。
 /// </summary>
 public class WebForm54 : System.Web.UI.Page
 {
  protected System.Web.UI.HtmlControls.HtmlGenericControl div_load;
  protected System.Web.UI.WebControls.Button btn_startwork;
  protected System.Web.UI.WebControls.Label lab_state;
  protected System.Web.UI.WebControls.Label lab_jg;
  protected work w;

  private void Page_Load(object sender, System.EventArgs e)
  {
   // 在此处放置用户代码以初始化页面
   if(Session["work"]==null)
   {
    w=new work();
    Session["work"]=w;
   }
   else
   {
    w=(work)Session["work"];
   }
   switch(w.State)
   {
    case 0:
    {
     this.div_load.Visible=false;
     break;
    }
    case 1:
    {
     this.lab_state.Text=""+((TimeSpan)(DateTime.Now-w.StartTime)).TotalSeconds.ToString("0.00")+" 秒过去了，完成百分比："+w.Percent+" ％";
     this.btn_startwork.Enabled=false;
     Page.RegisterStartupScript("","<script>window.setTimeout('location.href=location.href',1000);</script>");
     this.lab_jg.Text="";
     break;
    }
    case 2:
    {
     this.lab_jg.Text="任务结束,并且成功执行所有操作,用时 "+((TimeSpan)(w.FinishTime-w.StartTime)).TotalSeconds+" 秒";
     this.btn_startwork.Enabled=true;
     this.div_load.Visible=false;
     break;
    }
    case 3:
    {
     this.lab_jg.Text="任务结束,在"+((TimeSpan)(w.ErrorTime-w.StartTime)).TotalSeconds+"秒的时候发生错误导致任务失败'";
     this.btn_startwork.Enabled=true;
     this.div_load.Visible=false;
     break;
    }
   }
  }

  #region Web 窗体设计器生成的代码
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
   //
   InitializeComponent();
   base.OnInit(e);
  }
  
  /// <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.btn_startwork.Click += new System.EventHandler(this.btn_startwork_Click);
   this.Load += new System.EventHandler(this.Page_Load);

  }
  #endregion

  private void btn_startwork_Click(object sender, System.EventArgs e)
  {
   if(w.State!=1)
   {
    this.btn_startwork.Enabled=false;
    this.div_load.Visible=true;
    w.runwork();
    Page.RegisterStartupScript("","<script>location.href=location.href;</script>");
            
   }
  }
 }

 public class work
 {
  public int State=0;//0-没有开始,1-正在运行,2-成功结束,3-失败结束
  public int Percent=0;//完成百分比
  public DateTime StartTime;
  public DateTime FinishTime;
  public DateTime ErrorTime;

  public void runwork()
  {
   lock(this)
   {
    if(State!=1)
    {
     State=1;
     StartTime=DateTime.Now;
     System.Threading.Thread thread=new System.Threading.Thread(new System.Threading.ThreadStart(dowork));
     thread.Start();                        
    }
   }
  }

  private void dowork()
  {
   try
   {
    SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]);
    SqlCommand cmd=new SqlCommand("Insert Into test (test)values('test')",conn);
    conn.Open();
    for(int p=0;p<100;p++)
    {
     for(int i=0;i<10;i++)
     {
      cmd.ExecuteNonQuery();
     }
     Percent=p;//这里就是定义百分比，你估计这个操作费多少时间定义多少百分比
    }
    conn.Close();
    //以上代码执行一个比较消耗时间的数据库操作
    State=2;
   }
   catch
   {
    ErrorTime=DateTime.Now;
    Percent=0;
    State=3;
   }
   finally
   {
    FinishTime=DateTime.Now;
    Percent=0;
   }
  }
 }
}