COM

[ComRegisterFunction()]
       public static void RegisterClass(string key)
       {
           StringBuilder sb = new StringBuilder(key);
           sb.Replace(@"HKEY_CLASSES_ROOT\", "");
           RegistryKey k = Registry.ClassesRoot.OpenSubKey(sb.ToString(), true);
           RegistryKey ctrl = k.CreateSubKey("Control");
           ctrl.Close();
           RegistryKey inprocServer32 = k.OpenSubKey("InprocServer32", true);
           inprocServer32.SetValue("CodeBase", Assembly.GetExecutingAssembly().CodeBase);
           inprocServer32.Close();
           k.Close();
           MessageBox.Show("Registered");
       }

       [ComUnregisterFunction()]
       public static void UnregisterClass(string key)
       {
           StringBuilder sb = new StringBuilder(key);
           sb.Replace(@"HKEY_CLASSES_ROOT\", "");
           RegistryKey k = Registry.ClassesRoot.OpenSubKey(sb.ToString(), true);
           k.DeleteSubKey("Control", false);
           k.OpenSubKey("InprocServer32", true);
           k.DeleteSubKey("CodeBase", false);
           k.Close();
           MessageBox.Show("UnRegistered");
       }