Check .Net Framework updates

gistfile1.txt

//Determine Which .NET Framework Updates Are Installed
public static string DotNetUpdates()
{
    String retVal = "";

    using (
        RegistryKey baseKey =
            RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32)
                       .OpenSubKey(@"SOFTWARE\Microsoft\Updates"))
    {
        foreach (string baseKeyName in baseKey.GetSubKeyNames())
        {
            if (baseKeyName.Contains(".NET Framework") || baseKeyName.StartsWith("KB") ||
                baseKeyName.Contains(".NETFramework"))
            {
                using (RegistryKey updateKey = baseKey.OpenSubKey(baseKeyName))
                {
                    var name = (string)updateKey.GetValue("PackageName", "");
                    retVal += Environment.NewLine + (baseKeyName + "  " + name);
                    foreach (string kbKeyName in updateKey.GetSubKeyNames())
                    {
                        using (RegistryKey kbKey = updateKey.OpenSubKey(kbKeyName))
                        {
                            name = (string)kbKey.GetValue("PackageName", "");
                            retVal += Environment.NewLine + ("  " + kbKeyName + "  " + name);

                            if (kbKey.SubKeyCount > 0)
                            {
                                foreach (string sbKeyName in updateKey.GetSubKeyNames())
                                {
                                    using (RegistryKey sbSubKey = kbKey.OpenSubKey(sbKeyName))
                                    {
                                        name = (string)sbSubKey.GetValue("PackageName", "");
                                        if (name == "")
                                            name = (string)sbSubKey.GetValue("Description", "");
                                        retVal += Environment.NewLine + ("    " + sbKeyName + "  " + name);
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
    return retVal;
}