问数据库直到移到前一个或下一个记录后才更新数据库

EN

public partial class Navigeren : UserControl
{
    private readonly SqLiteDataAccess _sqLiteDataAccess;
    private Timer _saveTimer;
    private DataViewManager _dsView;
    public Navigeren()
    {
        InitializeComponent();
        _sqLiteDataAccess = new SqLiteDataAccess();
        DataBinding();
        _saveTimer = new Timer {Interval = 1000};
        _saveTimer.Tick += _saveTimer_Tick;
        _saveTimer.Start();
    }

    private void _saveTimer_Tick(object sender, EventArgs e)
    {
        _sqLiteDataAccess.UpdatePersonen(_dsView.DataSet);
         // Tried using SqLiteDataAccess.PersonenDataSet gives me the same result.
    }

    private void DataBinding()
    {
        _dsView = SqLiteDataAccess.PersonenDataSet.DefaultViewManager;
        textId.DataBindings.Add("Text", _dsView, "Personen.id", false, DataSourceUpdateMode.OnPropertyChanged);
        textNaam.DataBindings.Add("Text", _dsView, "Personen.name", false, DataSourceUpdateMode.OnPropertyChanged);
        textAdres.DataBindings.Add("Text", _dsView, "Personen.adres", false, DataSourceUpdateMode.OnPropertyChanged);
        checkGehuwd.DataBindings.Add("Checked", _dsView, "Personen.gehuwd", false, DataSourceUpdateMode.OnPropertyChanged);
    }

    private void buttonNext_Click(object sender, EventArgs e)
    {
        CurrencyManager cm = (CurrencyManager)this.BindingContext[_dsView, "Personen"];
        if (cm.Position < cm.Count - 1)
        {
            cm.Position++;
        }
    }

    private void buttonPrev_Click(object sender, EventArgs e)
    {
        if (this.BindingContext[_dsView, "Personen"].Position > 0)
        {
            this.BindingContext[_dsView, "Personen"].Position--;
        }
    }
}

class SqLiteDataAccess
{
    private SQLiteConnection _sqliteconnection;
    private string _database = @"Database.sqlite";

    private static DataSet _personenDataSet;
    public static DataSet PersonenDataSet
    {
        get { return _personenDataSet; }
        set { _personenDataSet = value; }
    }

    public SqLiteDataAccess()
    {
        OpenConnection();
        CreateTable();
        CreateTableGeslachten();
        CreateTableLanden();
        FillDataSet();
    }

    private void OpenConnection()
    {
        if (!File.Exists(_database))
            SQLiteConnection.CreateFile(_database);
        _sqliteconnection = new SQLiteConnection("Data Source=" + _database + ";Version=3;");
        _sqliteconnection.Open();
    }

    private void CreateTable()
    {
        try
        {
            string sql = "CREATE TABLE Personen (" +
                         "id INTEGER PRIMARY KEY AUTOINCREMENT, " +
                         "name VARCHAR, " +
                         "adres VARCHAR, " +
                         "gehuwd INT, " +
                         "land INT, " +
                         "geslacht INT, " +
                         "telnr VARCHAR, " +
                         "studies VARCHAR, " +
                         "geboorteDatum DATETIME, " +
                         "foto BLOB)";

            SQLiteCommand command = new SQLiteCommand(sql, _sqliteconnection);
            command.ExecuteNonQuery();
        }
        catch (SQLiteException sle)
        {

        }
    }

    private void CreateTableGeslachten()
    {
        try
        {
            string sql = "CREATE TABLE Geslachten (" +
                         "id INTEGER PRIMARY KEY AUTOINCREMENT, " +
                         "geslacht TEXT," +
                         "FOREIGN KEY(id) REFERENCES Personen(geslacht));";

            SQLiteCommand command = new SQLiteCommand(sql, _sqliteconnection);
            command.ExecuteNonQuery();
            InsertTableGeslachten();
        }
        catch (SQLiteException sle)
        {

        }
    }

    private void InsertTableGeslachten()
    {
        string sql = "INSERT INTO Geslachten(geslacht) VALUES('Man'), ('Vrouw');";
        SQLiteCommand command = new SQLiteCommand(sql, _sqliteconnection);
        command.ExecuteNonQuery();
    }

    private void CreateTableLanden()
    {
        try
        {
            string sql = "CREATE TABLE Landen (" +
                         "id INTEGER PRIMARY KEY AUTOINCREMENT, " +
                         "land TEXT," +
                         "FOREIGN KEY(id) REFERENCES Personen(land));";

            SQLiteCommand command = new SQLiteCommand(sql, _sqliteconnection);
            command.ExecuteNonQuery();
            InsertTableLanden();
        }
        catch (SQLiteException sle)
        {
        }
    }  

    public void Insert(string name, string adres, bool gehuwd, int land, int geslacht, string telnr, string studies,
        string geboorteDatum, byte[] foto)
    {
        var sql =
            new StringBuilder(
                "insert into Personen (name, adres, gehuwd, land, geslacht, telnr, studies,  geboorteDatum) values ('");
        sql.Append(name).Append("','")
            .Append(adres).Append("','")
            .Append(Convert.ToInt32(gehuwd)).Append("','")
            .Append(land).Append("','")
            .Append(geslacht).Append("','")
            .Append(telnr).Append("','")
            .Append(studies).Append("','")
            .Append(geboorteDatum).Append("');");
        //  .Append(foto).Append(");");            
        SQLiteCommand command = new SQLiteCommand(sql.ToString(), _sqliteconnection);
        command.ExecuteNonQuery();
    }

    public void FillDataSet()
    {
        SqLiteDataAccess.PersonenDataSet = new DataSet();
        try
        {
            string query = "select * from Personen";
            SQLiteDataAdapter da = new SQLiteDataAdapter(query, _sqliteconnection);
            da.Fill(PersonenDataSet, "Personen");
            string query2 = "select id, geslacht from geslachten";
            SQLiteDataAdapter da2 = new SQLiteDataAdapter(query2, _sqliteconnection);
            da2.Fill(PersonenDataSet, "Geslachten");
            string query3 = "select id, land from Landen";
            SQLiteDataAdapter da3 = new SQLiteDataAdapter(query3, _sqliteconnection);
            da3.Fill(PersonenDataSet, "Landen");
        }
        catch (Exception ex)
        {

        }
    }

    public void UpdatePersonen(DataSet ds)
    {
        try
        {
            string query = "select * from Personen";
            SQLiteDataAdapter da = new SQLiteDataAdapter(query, _sqliteconnection);
            SQLiteCommandBuilder sqLiteCommandBuilder = new SQLiteCommandBuilder(da);
            da.Update(ds, "Personen");
        }
        catch (Exception ex)
        {
            MessageBox.Show("Test");
        }
    }