public void fillComboboxLocationName(ComboBox comboBox)
    {
        comboBox.Items.Clear();
        locationDB = new LocationDB();
        connection = new DBConnection();
        SqlDataReader reader = locationDB.fillComboboxLocationName();

        while (reader.Read())
        {
            comboBox.Items.Add(reader["name"]);
        }
        connection.close();
    }