how to hide datagridview header row

See more:

C#

C#4.0

Hai friends,
the below code for selecting datagridview rows value to textbox of my windows form

private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
       {
           //if (dataGridView1.CurrentRow.Index == 0)
          // {
             //  MessageBox.Show("please dont select Header columns");

          // }

           if (dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString() == "Select")
           {
               //int index = dataGridView1.CurrentRow.Index;

               textBox1.Text = dataGridView1.Rows[e.RowIndex].Cells["School_id"].Value.ToString();
               textBox1.ReadOnly = true;
               textBox2.Text = dataGridView1.Rows[e.RowIndex].Cells["School_name"].Value.ToString();
           }
           else
           {
               MessageBox.Show("please enter select button only");
           }

           }
       }

Here "select" is a gridview button.

suppose when i wrongly click the head row of datagridview the error would ocuur as indexoutofboundexception .please help to inactive this head row.
thank you in advance