asp.net 局部更新

# 后台
 protected void D(object sender, EventArgs e)
        {
            Label1.Text = DateTime.Now.ToString();
            
            <span style="color:#ff9966;">ScriptManager1.RegisterAsyncPostBackControl(this.Button1);
            UpdatePanel1.Update();</span>
            //var j = 50;
            //Page.ClientScript.RegisterStartupScript(GetType(), "key" + j, "<script>D(" + j + ");</script>", false);
            for (int j = 3; j < 10; j++)
            {
                SetProgress(j);
               // Thread.Sleep(1000);
              

            }
            //var k = 93;
            //////for (int j = 0; j < 100; j++)
            //////{
            //////    Thread.Sleep(10000);
            ////    // ScriptManager.RegisterStartupScript(this, Page.GetType(), "", "D("+j+");", true);
            ////  //  this.Page.ClientScript.RegisterStartupScript(csType, "", "<script>Go("+j+");</script>", false);
            ////for (k=90; k > 0; k--)
            ////{
            //this.Page.ClientScript.RegisterStartupScript(GetType(), "", "<script>D(" + k + ");</script>", false);
        }
前端 
<div>
            
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
            <asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers="True" UpdateMode="Conditional">
                
                
             <span style="color:#ff9966;"> <ContentTemplate></span>
              <asp:Label runat="server" Text="Label" ID="Label1"></asp:Label>

              </ContentTemplate>
            <%--<div id="p"></div>--%>
        </asp:UpdatePanel>
        <div id="p"></div>
        <asp:Button ID="Button1" runat="server" Text="Button" OnClick="D"  />
        
       
    </div>