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LoginValidate.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="LoginValidate.aspx.cs" Inherits="LoginValidate" %>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ÑéÖ¤Óû§ÃûÊÇ·ñ´æÔÚ</title>
<script type="text/javascript">
    var xmlHttp;
    function createXMLHttpRequest()
    {
        if(window.ActiveXObject)
        {
            xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        else if(window.XMLHttpRequest)
        {
            xmlHttp = new XMLHttpRequest();
        }
    }
    //´¦Àí·½·¨
    function CheckUserName()
    {
        createXMLHttpRequest();
        var url= "LoginValidate.ashx?username="+document.getElementById("username").value;
        xmlHttp.open("GET",url,true);
        xmlHttp.onreadystatechange=ShowResult;
        xmlHttp.send(null);
        //document.getElementById("Msg").innerHTML='';
    }
    //»Øµ÷·½·¨
    function ShowResult()
    {
        if(xmlHttp.readyState==4)
        {
            if(xmlHttp.status=


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