private void cmbFilter_SelectedIndexChanged(object sender, EventArgs e)
        {
            var    re   = new ManageTestRepo();
            string type = cmbFilter.SelectedItem.ToString();

            if (type == "Male" || type == "Female")
            {
                re.FilterBySex(type, mgvTest);
            }
            if (type == "Child")
            {
                re.ChildFilter(mgvTest);
            }
            if (type == "Youth")
            {
                re.YouthFilter(mgvTest);
            }
            if (type == "Adult")
            {
                re.AdultFilter(mgvTest);
            }
            if (type == "Senior")
            {
                re.SeniorFilter(mgvTest);
            }
        }