private void simpleButton1_Click(object sender, EventArgs e)
{
gridControl1.DataSource = dt.NhanXetHangTuan_SELECT();
txtMaHS.DataBindings.Clear();
txtMaHS.DataBindings.Add("Text", gridControl1.DataSource, "StudentID");
txtHoHS.DataBindings.Clear();
txtHoHS.DataBindings.Add("Text", gridControl1.DataSource, "FirstName");
txtTenHS.DataBindings.Clear();
txtTenHS.DataBindings.Add("Text", gridControl1.DataSource, "LastName");
cboTuan.DataBindings.Clear();
cboTuan.DataBindings.Add("Text", gridControl1.DataSource, "WeeklyTaskID");
cboNamHoc.DataBindings.Clear();
cboNamHoc.DataBindings.Add("Text", gridControl1.DataSource, "MonthlyTaskID");
}