Button Not Firing on DataGridView

DataGridViewButtonColumn btnCancel = new DataGridViewButtonColumn();
btnCancel.Name = "btnCanel";
btnCancel.HeaderText = "Cancel";
btnCancel.Text = "CANCEL";
btnCancel.FlatStyle = FlatStyle.Popup;
btnCancel.DefaultCellStyle.ForeColor = Color.Red;
btnCancel.DefaultCellStyle.BackColor = Color.Gainsboro;
btnCancel.UseColumnTextForButtonValue = true;

dataGridView1.Columns.Insert(0, btnCancel);

private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
      if (e.ColumnIndex == 0 && e.RowIndex >= 0)
      {
          ulong ordID = (ulong)dataGridView1.Rows[e.RowIndex].Cells[1].Value;
          myFunc(ordID);
      }
}