how to bind datas from two different tables into a single datagridview using datareader or dataset,in windows application form

Hi..
i want to bind datas from two different tables into a single datagridview.Here i am using batch select query to get datas,and binding can be done using datareader or dataadapter.But i am getting datas from first table only.How can i bind datas from two tables here.Am attaching the code below.Help me please..
Thanks in advance.
swathi.
 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
 
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
bindgrid();
 
}
private void bindgrid()
{
 
SqlConnection con = new SqlConnection("Data Source=(local);Initial Catalog=book;User ID=sa;Password=nest123@!");
con.Open();
SqlCommand cmd = new SqlCommand(@"select id,name,author,price from sale;select invc_id,totalprice from bill", con);
SqlDataAdapter sda=new SqlDataAdapter(cmd);
cmd.ExecuteNonQuery();
SqlCommandBuilder sc = new SqlCommandBuilder(sda);
DataTable dt = new DataTable("sale", "bill");

sda.Fill(dt);
dataGridView1.DataSource = dt;



 





}

 

 

}
}