在C#中使用DataGridView处的箭头

Question

因此，我有一个DataGridViewwhere，我正在从我的Access数据库填充信息。DataGridView的第一列显示为来自我的网络的IP。我尝试做的是使用键盘上的上下箭头，将每一行的信息显示到几个TextBox中。代码如下：

private void dataGridView1_KeyDown(object sender, KeyEventArgs e)
{
    bool pingable = false;
    Ping pinger = new Ping();
    foreach (DataGridViewRow row in dataGridView1.SelectedRows)
    {
        PingReply reply = pinger.Send(row.Cells[0].Value.ToString());
        if (e.KeyCode == Keys.Down)
        {
            txtIP.Text = row.Cells[0].Value.ToString();
            txtUser.Text = row.Cells[1].Value.ToString();
            txtComputer.Text = row.Cells[2].Value.ToString();
            txtUnity.Text = row.Cells[3].Value.ToString();
            txtSession.Text = row.Cells[4].Value.ToString();
            if (pingable = reply.Status == IPStatus.Success)
            {
                pictureBoxGreen.Show();
                pictureBoxRed.Hide();
            }
            else if (pingable = reply.Status == IPStatus.TimedOut)
            {
                pcGreen.Hide();
                pcRed.Show();
            }
        }
        if (e.KeyCode == Keys.Up)
        {
            txtIP.Text = row.Cells[0].Value.ToString();
            txtUser.Text = row.Cells[1].Value.ToString();
            txtComputer.Text = row.Cells[2].Value.ToString();
            txtUnity.Text = row.Cells[3].Value.ToString();
            txtSession.Text = row.Cells[4].Value.ToString();
            if (pingable = reply.Status == IPStatus.Success)
            {
                pictureBoxGreen.Show();
                pictureBoxRed.Hide();
            }
            else if (pingable = reply.Status == IPStatus.TimedOut)
            {
                pictureBoxGreen.Hide();
                pictureBoxRed.Show();
            }
        }
    }
}

问题是，例如，在DataGridView的第一行单击并使用箭头后，它不会显示正确的信息，而是显示上面行的信息。你知道问题出在哪里吗？