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Editorial Team
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Asked: 2026-06-13T19:15:04+00:00

Imagine a simple html page with 3 iframes pointing to the same url: <html

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Imagine a simple html page with 3 iframes pointing to the same url:

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
</head>
<body>
    <iframe src="http://www.mydom.com/mypage.aspx"></iframe>
    <iframe src="http://www.mydom.com/mypage.aspx"></iframe>
    <iframe src="http://www.mydom.com/mypage.aspx"></iframe>
</body>
</html>

My goal is to track unique visitors in mypage.aspx code behind. Sounds simple but the following:

if (Request.Cookies["myc"] == null)
{
    // New visitor!
    Response.Cookies["myc"].Value = myval;
    Response.Cookies["myc"].Expires = DateTime.Now.AddYears(10);
}
else
{
    // Returning visitor
}

has a problem. Visiting the html page with the 3 iframes I get three simultaneous hits to mypage.aspx and Request.Cookies[“myc”] is null all three times while I should understand that it is the same user (1st hit: new visitor, 2nd and 3rd hits: returning visitor for a total of one visitor/user). Any ideas how to fix this?

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1 Answer

  1. Editorial Team

    All you have to do is to put the same code in a [webMethod] instead of in PageLoad then call the [WebMethod] from client via js (XMLHttpRequest), you will receive the three calls in sequence. No more probs due to simultaneous hits.

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