how to fire click event for datagridview cells

private void dataGridView2_Click(object sender, DataGridViewCellEventArgs e)
        {
                DataGridViewImageCell cell = (DataGridViewImageCell)
                dataGridView2.Rows[e.RowIndex].Cells[e.ColumnIndex];
                if (cell.Value=="sewagram express")
                {
                    SqlCommand cm1 = new SqlCommand("select * from sewagram", con);
                    DataTable dth = new DataTable();
                    SqlDataAdapter da = new SqlDataAdapter(cm1);
                    da.Fill(dth);
                    dataGridView1.DataSource = dth;
                }
        }