how to enable enhanced protected mode using C#

private bool IsEPMEnabled() 
{ 
    using (RegistryKey key = Registry.CurrentUser.OpenSubKey("Software\Microsoft\Internet Explorer\Main", false)) 
    { 
        if (key != null) 
            return ((string)key.GetValue("Isolation", String.Empty) == "PMEM");  
    } 
 
    return false; 
}