public void Execute(object parameter)
        {
            SqlCeConnection conn = new SqlCeConnection("Data Source = Datenbank\\Daten.sdf");
            conn.Open();
            SqlCeDataAdapter adp = new SqlCeDataAdapter();
            // Create the SelectCommand
            SqlCeCommand cmd = conn.CreateCommand();
            cmd.CommandText = "SELECT * FROM Kontakte";
            adp.SelectCommand = cmd;

            // Create the InsertCommand
            //
            cmd = conn.CreateCommand();
            cmd.CommandText = "INSERT INTO Kontakte (ID, Vorname, Nachname, Telefonnumer, Handynummer, Strasse, Hausnummer, PLZ, Ort, Land) " + "VALUES (@ID, @Vorname, @Nachname, @Telefonnumer, @Handynummer, @Strasse, @Hausnummer, @PLZ, @Ort, @Land)";

            // Add the parameters for the InsertCommand.
            cmd.Parameters.Add("@ID", SqlDbType.Int, 4, "ID");
            cmd.Parameters.Add("@Vorname", SqlDbType.NChar, 100, "Vorname");
            cmd.Parameters.Add("@Nachname", SqlDbType.NChar, 100, "Nachname");
            cmd.Parameters.Add("@Telefonnumer", SqlDbType.Int, 4, "Telefonnumer");
            cmd.Parameters.Add("@Handynummer", SqlDbType.Int, 4, "Handynummer");
            cmd.Parameters.Add("@Strasse", SqlDbType.NChar, 100, "Strasse");
            cmd.Parameters.Add("@Hausnummer", SqlDbType.NChar, 40, "Hausnummer");
            cmd.Parameters.Add("@PLZ", SqlDbType.Int, 4, "PLZ");
            cmd.Parameters.Add("@Ort", SqlDbType.NChar, 100, "Ort");
            cmd.Parameters.Add("@Land", SqlDbType.NChar, 100, "Land");
            adp.InsertCommand = cmd;

            DataSet ds = new DataSet();
            adp.Fill(ds);
            ds.Tables[0].Rows.Add(new object[] {0, "Test", "Test", 0, 0, "nix", "nix", 0, "nix", "nix" });
            adp.Update(ds.Tables[0]);
            adp.InsertCommand.Dispose();
            adp.SelectCommand.Dispose();
        }

SqlCeConnection conn = new SqlCeConnection("Data Source = Datenbank\\Daten.sdf");
conn.Open();
SqlCeCommand cmd = new SqlCeCommand("INSERT INTO Kontakte (Vorname, Nachname, Telefonnumer, Handynummer, Strasse, Hausnummer, PLZ, Ort, Land) VALUES ('Vorname', 'Nachname', 767, 567, 'Strasse', 'Hausnummer', 89, 'Ort', 'Land')", conn);
int test = cmd.ExecuteNonQuery();
conn.Close();