private void btnSearch_Click(object sender, EventArgs e)
        {
            //var sql = "select id,name,age,sex,tests,date,time from test where id ";
            var en = new DoctorTestEntity();
            var re = new DoctorTestRepo();

            en.Id   = txtId.Text;
            en.Name = txtName.Text;
            en.Date = dtpDate.Value.ToString("yyyy-MM-dd");

            re.Search(en, mgvTest);
        }
        public void Search(DoctorTestEntity en, MetroGrid grid)
        {
            var sql = "select id,name,age,sex,tests,date,time from test where id = '" + en.Id + "' or name = '" + en.Name + "' or date = '" + en.Date + "'";

            DataAccess.PopulateGridView(grid, sql);
        }