private void btnBaoCao_Click(object sender, EventArgs e) { DataTable dt = new DataTable(); SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=qlks3lop;Integrated Security=True"); SqlCommand com = new SqlCommand(); SqlDataAdapter da = new SqlDataAdapter(); com.CommandText = "thongkedatphong " + cmbThang.Text + "," + cmbNam.Text; com.Connection = con; con.Open(); da.SelectCommand = com; da.Fill(dt); FormCRThongKeDatPhong frm = new FormCRThongKeDatPhong(); frm.frmTK = this; frm.frmMain = this.frmMain; frm.dt = dt; frm.ShowDialog(); }