RegisterFunction z

#region SolidWorks Registration
[ComRegisterFunctionAttribute]
        public static void RegisterFunction(Type t)
        {
            #region Get Custom Attribute: SwAddinAttribute
            SwAddinAttribute SWattr = null;
            Type type = typeof(SwAddin);

            foreach (System.Attribute attr in type.GetCustomAttributes(false))
            {
                if (attr is SwAddinAttribute)
                {
                    SWattr = attr as SwAddinAttribute;
                    break;
                }
            }

            #endregion

            try
            {
                Microsoft.Win32.RegistryKey hklm = Microsoft.Win32.Registry.LocalMachine;
                Microsoft.Win32.RegistryKey hkcu = Microsoft.Win32.Registry.CurrentUser;

                string keyname = "SOFTWARE\\SolidWorks\\Addins\\{" + t.GUID.ToString() + "}";
                Microsoft.Win32.RegistryKey addinkey = hklm.CreateSubKey(keyname);
                addinkey.SetValue(null, );

                addinkey.SetValue("Description", SWattr.Description);
                addinkey.SetValue("Title", SWattr.Title);

                keyname = "Software\\SolidWorks\\AddInsStartup\\{" + t.GUID.ToString() + "}";
                addinkey = hkcu.CreateSubKey(keyname);
                addinkey.SetValue(null, Convert.ToInt32(SWattr.LoadAtStartup), Microsoft.Win32.RegistryValueKind.DWord);
            }
            catch (System.NullReferenceException nl)
            {
                Console.WriteLine("There was a problem registering this dll: SWattr is null. \n\"" + nl.Message + "\"");
                System.Windows.Forms.MessageBox.Show("There was a problem registering this dll: SWattr is null.\n\"" + nl.Message + "\"");
            }

            catch (System.Exception e)
            {
                Console.WriteLine(e.Message);

                System.Windows.Forms.MessageBox.Show("There was a problem registering the function: \n\"" + e.Message + "\"");
            }
        }

[ComUnregisterFunctionAttribute]
        public static void UnregisterFunction(Type t)
        {
            try
            {
                Microsoft.Win32.RegistryKey hklm = Microsoft.Win32.Registry.LocalMachine;
                Microsoft.Win32.RegistryKey hkcu = Microsoft.Win32.Registry.CurrentUser;

                string keyname = "SOFTWARE\\SolidWorks\\Addins\\{" + t.GUID.ToString() + "}";
                hklm.DeleteSubKey(keyname);

                keyname = "Software\\SolidWorks\\AddInsStartup\\{" + t.GUID.ToString() + "}";
                hkcu.DeleteSubKey(keyname);
            }
            catch (System.NullReferenceException nl)
            {
                Console.WriteLine("There was a problem unregistering this dll: " + nl.Message);
                System.Windows.Forms.MessageBox.Show("There was a problem unregistering this dll: \n\"" + nl.Message + "\"");
            }
            catch (System.Exception e)
            {
                Console.WriteLine("There was a problem unregistering this dll: " + e.Message);
                System.Windows.Forms.MessageBox.Show("There was a problem unregistering this dll: \n\"" + e.Message + "\"");
            }
        }

        #endregion