Detect IE 11 - enhance Request.Browser (HttpBrowserCapabilities) in ASP.NET web application (C#)

In Global.asax.cs:

protected void Application_Start(Object sender, EventArgs e)
{
    ...
    HttpCapabilitiesBase.BrowserCapabilitiesProvider = new CustomerHttpCapabilitiesProvider();
    ...
}

Define class:

public class CustomerHttpCapabilitiesProvider : HttpCapabilitiesDefaultProvider

{

    public override HttpBrowserCapabilities GetBrowserCapabilities(HttpRequest request)

    {

        HttpBrowserCapabilities browser = base.GetBrowserCapabilities(request);

        // Correct for IE 11, which presents itself as Mozilla version 0.0

        string ua = request.UserAgent;

        // Ensure IE by checking for Trident

        // Teports the real IE version, not the compatibility view version. 

        if (ua.Contains(@"Trident"))

        {

            if (!browser.IsBrowser(@"IE"))
            {
                browser.AddBrowser(@"ie");
                browser.AddBrowser(@"ie6plus");
                browser.AddBrowser(@"ie10plus");
            }

            IDictionary caps = browser.Capabilities;

            caps[@"Browser"] = @"IE";

            // Determine browser version

            bool ok = false;

            string majorVersion = null; // convertable to in

            string minorVersion = null; // convertable to double

            Match m = Regex.Match(ua, @"rv:(\d+)\.(\d+)");

            if (m.Success)

            {

                ok = true;

                majorVersion = m.Groups[1].Value;

                minorVersion = m.Groups[2].Value; // typically 0

            }

            else

            {

                m = Regex.Match(ua, @"Trident/(\d+)\.(\d+)");

                if (m.Success)

                {

                    int v;

                    ok = int.TryParse(m.Groups[1].Value, out v);

                    if (ok)

                    {

                        v += 4; // Trident/7 = IE 11, Trident/6 = IE 10, Trident/5 = IE 9, and Trident/4 = IE 8

                        majorVersion = v.ToString(@"d");

                        minorVersion = m.Groups[2].Value; // typically 0

                    }

                }

            }

            if (ok)

            {

                caps[@"MajorVersion"] = majorVersion;

                caps[@"MinorVersion"] = minorVersion;

                caps[@"Version"] = String.Format(@"{0}.{1}", majorVersion, minorVersion);

            }

        }

        return browser;

    }

}