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browser detection not working with changing IE browser document mode

I have to include an additional js script for IE7.  I am using the IE7 developer tools to test different browsers.  If you open dev tools (press F12), then there is a tab where you can switch between IE9, 8, 7.  

No matter what this setting is on, I get the same info in C# using the function below.  (For some reason it always shows IE7.  When I try to find the version using JavaScript, I see the same version (9.0) no matter what the switch is on.

Question: How can I detect the browser and test using the IE document mode tab?

Output from js
console.log(navigator.userAgent);
LOG: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; MS-RTC LM 8; .NET CLR 1.1.4322; .NET4.0C; .NET4.0E; InfoPath.2)

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Output from C#
Browser Capabilities
Type = IE7
Name = IE
Version = 7.0
Major Version = 7
Minor Version = 0
Platform = WinNT
Is Beta = False
Is Crawler = False
Is AOL = False
Is Win16 = False
Is Win32 = True
Supports Frames = True
Supports Tables = True
Supports Cookies = True
Supports VBScript = True
Supports JavaScript = 1.2
Supports Java Applets = True
Supports ActiveX Controls = True

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public string GetBrowserInfo()
{
    System.Web.HttpBrowserCapabilities browser = Request.Browser;
    string browserString = "Browser Capabilities<br>"
        + "Type = " + browser.Type + "<br>"
        + "Name = " + browser.Browser + "<br>"
        + "Version = " + browser.Version + "<br>"
        + "Major Version = " + browser.MajorVersion + "<br>"
        + "Minor Version = " + browser.MinorVersion + "<br>"
        + "Platform = " + browser.Platform + "<br>"
        + "Is Beta = " + browser.Beta + "<br>"
        + "Is Crawler = " + browser.Crawler + "<br>"
        + "Is AOL = " + browser.AOL + "<br>"
        + "Is Win16 = " + browser.Win16 + "<br>"
        + "Is Win32 = " + browser.Win32 + "<br>"
        + "Supports Frames = " + browser.Frames + "<br>"
        + "Supports Tables = " + browser.Tables + "<br>"
        + "Supports Cookies = " + browser.Cookies + "<br>"
        + "Supports VBScript = " + browser.VBScript + "<br>"
        + "Supports JavaScript = " +
            browser.EcmaScriptVersion.ToString() + "<br>"
        + "Supports Java Applets = " + browser.JavaApplets + "<br>"
        + "Supports ActiveX Controls = " + browser.ActiveXControls
                + "<br>";
    return browserString;
}

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jackjohnson44

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