private void btnSortByDate_Click(object sender, EventArgs e)
        {
            clickedSortType = "Date";
            date            = txtDateReport.Text;

            DisplayAttendanceReport display = new DisplayAttendanceReport();

            display.ShowDialog();
        }
        private void btnSortByEmployeeId_Click(object sender, EventArgs e)
        {
            clickedSortType = "EmpID";
            sortID          = Int32.Parse(txtEmpIDReport.Text);

            DisplayAttendanceReport display = new DisplayAttendanceReport();

            display.ShowDialog();
        }
        private void btnSortByMonthYear_Click(object sender, EventArgs e)
        {
            clickedSortType = "MonthYear";
            month           = lblMonthReport.Text;
            year            = lblYearReport.Text;

            DisplayAttendanceReport display = new DisplayAttendanceReport();

            display.ShowDialog();
        }