asp.net中手写ajax

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<html>

<head>

<title>AjaxTest</title>

var xmlHttp;

function createXMLHttpRequest()

{

if(window.ActiveXObject)

{

xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");

} else if(window.XMLHttpRequest)

{

xmlHttp = new XMLHttpRequest();

}

function startRequest()

{

createXMLHttpRequest();

try {

var username=document.getElementById("<%=text1.ClientID %>").value;

xmlHttp.onreadystatechange = handleStateChange;

xmlHttp.open("GET", "validname.aspx?username="+username, true);

xmlHttp.send(null);

} catch(exception) {

alert("xmlHttp Fail");

}

function handleStateChange()

{

if(xmlHttp.readyState == 4)

{

if (xmlHttp.status == 200 || xmlHttp.status == 0)

{

var param = xmlHttp.responseText; document.getElementById("msg").innerHTML=param;

}

</script>

</head>

<body>

<div>

public void Page_Load()

{

string userName=Request.QueryString["username"];

if(iExists(userName))

{ Response.Write("用户名存在");

}

else

{

Response.Write("用户名可用");

} Response.End();

}

public bool iExists(string username){.....}