private void BtnDichVu_Click(object sender, EventArgs e) { try { ExportToExcel excel = new ExportToExcel(); DichVuBAL bal = new DichVuBAL(); DataTable dt = bal.DTDS(); excel.ExportDV(dt, "Dịch vụ", "Danh sách dịch vụ"); } catch (Exception ex) { MessageBox.Show(ex.Message); } }