How I Bind Datagridview1 Of Form "Order" With Datagridview1 Of Form Billing...

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C#

coding of form order is....

public partial class Orders : Form
   {
       SqlCommand cmd;
       SqlConnection cn;
       SqlDataReader dr;

       public Orders()
       {
           InitializeComponent();
       }


       private void button1_Click(object sender, EventArgs e)
       {
           dataGridView1.Rows.Add(comboBox1.Text,comboBox3.Text, comboBox2.Text,textBox2.Text);

           }

       private void Orders_Load(object sender, EventArgs e)
       {

           cn = new SqlConnection();
           cn.ConnectionString = ConfigurationManager.ConnectionStrings["Key"].ConnectionString;
       }

       private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
       {
           Int32 val1 = Convert.ToInt32(comboBox3.Text);
           Int32 val2 = Convert.ToInt32(comboBox2.Text);
           Int32 val3 = val1 * val2;
           textBox2.Text = val3.ToString();

       }

       private void button2_Click(object sender, EventArgs e)
       {
           try
           {
               dataGridView1.Rows.RemoveAt(dataGridView1.CurrentCell.RowIndex);
           }
           catch
           {
               MessageBox.Show("Must select the row first");
           }
       }

       private void button4_Click(object sender, EventArgs e)
       {
           int sum = 0;
           for (int i=0; i < dataGridView1.Rows.Count; ++i)
           {
               sum += Convert.ToInt32(dataGridView1.Rows[i].Cells[3].Value);
           }
           label7.Text = sum.ToString();
       }
   }

i have another form named bill. now i want inserted data in datagridview1 of form order copied to datagridview1 of form bill when i press button at form "order"...