how to detect edition of the windows in c# asp.net

//Get Operating system information.
String os_;
        OperatingSystem os = Environment.OSVersion;
        //Get version information about the os.
        Version vs = os.Version;

        //Variable to hold our return value
        string operatingSystem = "";

        if (os.Platform == PlatformID.Win32Windows)
        {
            //This is a pre-NT version of Windows
            switch (vs.Minor)
            {
                case 0:
                    operatingSystem = "95";
                    break;
                case 10:
                    if (vs.Revision.ToString() == "2222A")
                        operatingSystem = "98SE";
                    else
                        operatingSystem = "98";
                    break;
                case 90:
                    operatingSystem = "Me";
                    break;
                default:
                    break;
            }
        }
        else if (os.Platform == PlatformID.Win32NT)
        {
            switch (vs.Major)
            {
                case 3:
                    operatingSystem = "NT 3.51";
                    break;
                case 4:
                    operatingSystem = "NT 4.0";
                    break;
                case 5:
                    if (vs.Minor == 0)
                        operatingSystem = "2000";
                    else
                        operatingSystem = "XP";
                    break;
                case 6:
                    if (vs.Minor == 0)
                        operatingSystem = "Vista";
                    else
                        operatingSystem = "7";
                    break;
                default:
                    break;
            }
        }
        //Make sure we actually got something in our OS check
        //We don't want to just return " Service Pack 2" or " 32-bit"
        //That information is useless without the OS version.
        if (operatingSystem != "")
        {
            //Got something.  Let's prepend "Windows" and get more info.
            operatingSystem = "Windows " + operatingSystem;
            //See if there's a service pack installed.
            if (os.ServicePack != "")
            {
                //Append it to the OS name.  i.e. "Windows XP Service Pack 3"
                operatingSystem += " " + os.ServicePack;
            }
            //Append the OS architecture.  i.e. "Windows XP Service Pack 3 32-bit"
            //operatingSystem += " " + getOSArchitecture().ToString() + "-bit";
        }
        //Return the information we've gathered.
        os_ = operatingSystem;
Response.Write(os_);