protected void Page_Load(object sender, EventArgs e)

        {

            Response.ContentType = "text/event-stream";

            Response.Expires = -1;

            while (true)

            {

                Response.Write("date1235:" + DateTime.Now+"\n\n");

                Thread.Sleep(2000);

                //向客户端发送当前的缓冲数据

                //如果你将Flush写的循环外面，将会等循环执行完后一起显示到前台，当然这个是死循环

                Response.Flush();

            }

        }

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm8.aspx.cs" Inherits="WebApplication1.WebForm8" %>

<!DOCTYPE html><!--注意此处是HTML5的标识，写出这样代表目前用的html版本是5-->

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <div id="result">

    </div>

    </form>

</body>

</html>

<script type="text/javascript">

    //HTML5 服务器推送事件

    function ServerSendClient() {

        if (typeof (EventSource) !== "undefined") {

            var source = new EventSource("WebForm8.aspx.cs");

            source.onmessage = function (event) {

                document.getElementById("result").innerHTML += event.data + "<br />";

            };

        }

        else {

            document.getElementById("result").innerHTML = "Sorry, your browser does not support server-sent events...";

        }

    }

    ServerSendClient();

</script>