Print data from the datagridview by csharp in window application

How to print the data from the datagridview in csharp ,it's and window application.

I am able to print the datagridview ,with the help printdocument, and Bitmap.

But the problem is that gridview has scroll bar, so means some data is hidden there , so how can i print that.

private void button1_Click(object sender, EventArgs e)
       {
           string connectionString = "Data Source=.;Initial Catalog=pubs;Integrated Security=True";
           string sql = "SELECT * FROM Authors";
           SqlConnection connection = new SqlConnection(connectionString);
           SqlDataAdapter dataadapter = new SqlDataAdapter(sql, connection);
           DataSet ds = new DataSet();
           connection.Open();
           dataadapter.Fill(ds, "Author_table");
           connection.Close();
           dataGridView1.DataSource = ds;
           dataGridView1.DataMember = "Author_table";

       }

       private void button2_Click(object sender, EventArgs e)
       {
           printDocument1.Print();
       }

       private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
       {
           Bitmap bm = new Bitmap(this.dataGridView1.Width, this.dataGridView1.Height);
           dataGridView1.DrawToBitmap(bm, new Rectangle(0, 0, this.dataGridView1.Width, this.dataGridView1.Height));
           e.Graphics.DrawImage(bm, 0, 0);
       }

Tags: C#, Printing, DataGridView