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      httpRequest = createHttpRequest();
      httpRequest.onreadystatechange = aa;
      httpRequest.open("GET",url,true);
      httpRequest.send(null);
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var httpRequest = false;
var mesdivs = null
function sendRequest(url, mesdiv) {
 
    mesdivs = mesdiv;
    httpRequest = false;
    if (window.XMLHttpRequest) {
        httpRequest = new XMLHttpRequest();
......

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< asp:ScriptManager runat="server">< /asp:ScriptManager>
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function createXMLHttpRequest()

 var xmlHttp;
 if(Window.XMLHttpRequest)
 { 
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 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CustomValidatorTest.aspx.cs" Inherits="Web.CustomValidatorTest" %>
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