private void buttonAdd_Click(object sender, EventArgs e)
        {
            Diablog_NV d = new Diablog_NV();

            d.ShowDialog();
            View();
        }
        private void DataGird_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            string      id;
            NhanVienBUS bus = new NhanVienBUS();

            if (DataGird.Columns[e.ColumnIndex].Name == "Sua")
            {
                id = DataGird.Rows[e.RowIndex].Cells["MaNV"].Value.ToString();
                //MessageBox.Show(dataGrid.Rows[e.RowIndex].Cells["Id"].Value.ToString());
                string     cv = DataGird.Rows[e.RowIndex].Cells["TenChucVu"].Value.ToString();
                Diablog_NV d  = new Diablog_NV(id, cv);
                d.ShowDialog(this);
                View();
            }

            if (DataGird.Columns[e.ColumnIndex].Name == "Xoa")
            {
                id = DataGird.Rows[e.RowIndex].Cells["MaNV"].Value.ToString();
                bus.Delete(id);
                View();
            }
        }