private void cbbChuongTrinhHoc_SelectedIndexChanged(object sender, EventArgs e)
{
try
{
if (cbbChuongTrinhHoc.DataSource == null)
{
MessageBox.Show("Chuong trinh hoc hien tai chua co lop.", "Lỗi", MessageBoxButtons.OK, MessageBoxIcon.Information);
cbbLopHoc.DataSource = null;
}
else
{
_dtlop = _objlopbus.GetMaTen_TheoChuongTrinhHoc(cbbChuongTrinhHoc.SelectedValue.ToString());
if (_dtlop.Rows.Count != 0)
{
cbbLopHoc.DataSource = _dtlop;
cbbLopHoc.ValueMember = "MaLop";
cbbLopHoc.DisplayMember = "TenLop";
lblHocPhi.Text = String.Format("{0:0,0}", _objchuongtrinhhocbus.GetHocPhi_TheoMaChuongTrinhHoc(cbbChuongTrinhHoc.SelectedValue.ToString()));
}
else
{
cbbChuongTrinhHoc.DataSource = null;
}
}
}
catch
{
}
}
