Register key works in windows8, but gets null value in windows10

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C#

I am working with winforms and using web browser to open web page. Program works perfectly in windows 8, but in Windows 10, I am getting null value in register key value. I am using load event handler, this is the code:

private void Form1_Load(object sender, EventArgs e)
        {



            var appName = Process.GetCurrentProcess().ProcessName + "WindowsFormsApplication2.exe";

            var Key = Registry.CurrentUser.OpenSubKey(@"SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION", true);
            Key.SetValue(appName, 11000, RegistryValueKind.DWord);
            Key.Close();


        }

Maybe any ideas? Thanks in advance.