public static void saveSettings()
        {
            Settings4file st = new Settings4file();
            st.imgDir = Settings.imgDir;
            st.openFolderButtonVisible = Settings.openFolderButtonVisible;
            st.useDB = Settings.useFeDB;
            if (Settings.useFeDB)
            {
                st.DBSrvIP = Settings.DBSrvIP;
                st.DBSrvPort = Settings.DBSrvPort;
                st.DBconnectID = Settings.DBconnectID;
                st.DBconnectPw = PasswordEncoder.Encrypt(Settings.DBconnectPw);
            }
            else
            {
                st.DBSrvIP = "";
                st.DBSrvPort = "";
                st.DBconnectID = "";
                st.DBconnectPw = "";
            }

            XmlSerializer xserializer = new XmlSerializer(typeof(Settings4file));
            //Open file
            System.IO.FileStream fs1 =
                new System.IO.FileStream(Settings.settingFile_location, System.IO.FileMode.Create);
            xserializer.Serialize(fs1, st);
            fs1.Close();
        }
        //Read from file
        public static void readSettings()
        {
            if (System.IO.File.Exists(Settings.settingFile_location))
            {
                Settings4file st = new Settings4file();

                XmlSerializer xserializer = new XmlSerializer(typeof(Settings4file));
                System.IO.FileStream fs2 =
                    new System.IO.FileStream(Settings.settingFile_location, System.IO.FileMode.Open);
                try
                {
                    st = (Settings4file)xserializer.Deserialize(fs2);
                    fs2.Close();
                }
                catch (InvalidOperationException)
                {
                    DialogResult ret;
                    ret = MessageBox.Show(Properties.Resources.SettingFileBroken, "Error", MessageBoxButtons.YesNo, MessageBoxIcon.Error);
                    fs2.Close();
                    if (ret == DialogResult.Yes)
                    { file_control.delFile(Settings.settingFile_location); }
                }

                Settings.imgDir = st.imgDir;
                Settings.openFolderButtonVisible = st.openFolderButtonVisible;
                Settings.useFeDB = st.useDB;
                Settings.usePlugin = st.usePlugin;
                Settings.DBSrvIP = st.DBSrvIP;
                Settings.DBSrvPort = st.DBSrvPort;
                Settings.DBconnectID = st.DBconnectID;
                Settings.DBconnectPw = PasswordEncoder.Decrypt(st.DBconnectPw);
            }
        }