private void btnAddNew_Click(object sender, EventArgs e)
        {
            frmStatistics_SingleForm form = new frmStatistics_SingleForm(null, null);

            if (form.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                this.InitStatisticsGroup();
            }
        }
        private void btnUpdate_Click(object sender, EventArgs e)
        {
            if (this.dgvData.SelectedRows.Count == 0)
            {
                MessageBox.Show("請選擇待修改項目。");
                return;
            }
            if (this.dgvData.SelectedRows.Count > 1)
            {
                MessageBox.Show("僅能單筆刪除。");
                return;
            }
            UDT.Survey Survey = this.dgvData.SelectedRows[0].Cells[0].Tag as UDT.Survey;
            UDT.StatisticsGroup StatisticsGroup = this.dgvData.SelectedRows[0].Tag as UDT.StatisticsGroup;
            frmStatistics_SingleForm form = new frmStatistics_SingleForm(StatisticsGroup, Survey);

            if (form.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                this.InitStatisticsGroup();
            }
        }