private void dgvBillDetail_CellClick(object sender, DataGridViewCellEventArgs e) { try { if (dgvBillDetail.Columns[e.ColumnIndex].Name == "btnViewColumn") { int id = (int)dgvBillDetail.Rows[e.RowIndex].Cells["Mã Hóa Đơn"].Value; dgvBillDetail.Columns.RemoveAt(e.ColumnIndex); dgvBillDetail.DataSource = ""; dgvBillDetail.DataSource = BillDAL.GetDetailsByBillId(id); } } catch (Exception ex) { } }