using System;
using System.Windows.Forms;
using System.Diagnostics;
using System.Security.Permissions;
using Microsoft.Win32;

[PermissionSet(SecurityAction.Demand, Name = "FullTrust")]

public class Program : Form

private WebBrowser webBrowser;

public Program()
{
    InitialiseForm();
}

public void InitialiseForm()
{
    webBrowser = new WebBrowser();
    Controls.AddRange(new Control[] {webBrowser});
    webBrowser.ScriptErrorsSuppressed = true;
    webBrowser.Dock = DockStyle.Fill;

    webBrowser.Navigate("http://www.nationalgeographic.com/");

}

[STAThread]

public static void Main()
{
    Application.EnableVisualStyles();
    Application.Run(new Program());
}

private void Form1_Load(object sender, EventArgs e)
    {
        var appName = Process.GetCurrentProcess().ProcessName + ".exe";
        SetIE8KeyforWebBrowserControl(appName);
    }

    private void SetIE8KeyforWebBrowserControl(string appName)
    {
        RegistryKey Regkey = null;
        try
        {
                // For 64 bit machine
            //if (Environment.Is64BitOperatingSystem)
                //Regkey = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\MAIN\FeatureControl\FEATURE_BROWSER_EMULATION", true);

//else
//For 32 bit machine
        Regkey = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION", true);


    // If the path is not correct or
    // if the user haven't priviledges to access the registry
    if (Regkey == null)
    {
        MessageBox.Show("Application Settings Failed - Address Not found");
        return;
    }

    string FindAppkey = Convert.ToString(Regkey.GetValue(appName));

    // Check if key is already present
    if (FindAppkey == "8000")
    {
        MessageBox.Show("Required Application Settings Present");
        Regkey.Close();
        return;
    }

    // If a key is not present add the key, Key value 8000 (decimal)
    if (string.IsNullOrEmpty(FindAppkey))
        Regkey.SetValue(appName, unchecked((int)0x1F40), RegistryValueKind.DWord);

    // Check for the key after adding
    FindAppkey = Convert.ToString(Regkey.GetValue(appName));

    if (FindAppkey == "8000")
        MessageBox.Show("Application Settings Applied Successfully");
    else
        MessageBox.Show("Application Settings Failed, Ref: " + FindAppkey);
}
catch (Exception ex)
{
    MessageBox.Show("Application Settings Failed");
    MessageBox.Show(ex.Message);
}
finally
{
    // Close the Registry
    if (Regkey != null)
        Regkey.Close();
}