How to enable arrow key (up and down) for Rad Grid ?

this.radGridView1.PreviewKeyDown += RadGridView1_PreviewKeyDown;
this.radGridView1.CurrentRowChanged += RadGridView1_CurrentRowChanged;

private void RadGridView1_CurrentRowChanged(object sender, CurrentRowChangedEventArgs e)
{
    if (updownpressed)
    {
        var value = e.CurrentRow.Cells[0].Value;     
    }
}
bool updownpressed=false;
private void RadGridView1_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
{
    if (e.KeyCode == Keys.Up || e.KeyCode == Keys.Down)
    {
        updownpressed = true;
    }
    else
    {
        updownpressed = false;
    }
}