/// <summary>
        /// The ButtonModify_Click method.
        /// </summary>
        /// <param name="sender">The <paramref name="sender"/> parameter.</param>
        /// <param name="args">The <paramref name="args"/> parameter.</param>
        private void ButtonModify_Click(object sender, EventArgs args)
        {
            if (lvTimeTableManager.SelectedItems.Count == 0)
            {
                return;
            }

            var timeTable = (TimeTable)lvTimeTableManager.SelectedItems[0].Tag;

            // Show the ModifyTimeTableForm dialog.
            DialogResult result;

            using (var modifyTimeTableForm = new ModifyTimeTableForm(timeTable))
            {
                result = modifyTimeTableForm.ShowDialog();
            }

            // If the dialog was closed without clicking OK then skip the refresh.
            if (result != DialogResult.OK)
            {
                return;
            }

            // Refresh the items in the list view.
            PopulateTimeTables();
        }
        /// <summary>
        /// The ButtonAdd_Click method.
        /// </summary>
        /// <param name="sender">The <paramref name="sender"/> parameter.</param>
        /// <param name="args">The <paramref name="args"/> parameter.</param>
        private void ButtonAdd_Click(object sender, EventArgs args)
        {
            // Show the ModifyTimeTableForm dialog.
            DialogResult result;

            using (var modifyTimeTableForm = new ModifyTimeTableForm(new NewTimeTable()))
            {
                result = modifyTimeTableForm.ShowDialog();
            }

            // If the dialog was closed without clicking OK then skip the refresh.
            if (result != DialogResult.OK)
            {
                return;
            }

            // Refresh the items in the list view.
            PopulateTimeTables();
        }