private void frmDSNV_Load(object sender, EventArgs e)
        {
            string         query   = "SELECT MaNV, HoTenNV, NgaySinh, GioiTinh, DiaChi, SDT, ChucVu FROM NHANVIEN";
            DataTable      tblDSNV = new DataTable();
            SqlDataAdapter da      = new SqlDataAdapter(query, XLBang.cnnStr);

            try
            {
                da.Fill(tblDSNV);
                rpDSNV rpt = new rpDSNV();
                rpt.SetDataSource(tblDSNV);
                rptvDSNV.ReportSource = rpt;
            }
            catch (SqlException ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }