capture all keyboard key including

private void Form1_Load(object sender, EventArgs e)
{
    this.KeyPreview = true;
    this.PreviewKeyDown += new PreviewKeyDownEventHandler(Form1_PreviewKeyDown);
    textBox1.PreviewKeyDown += new PreviewKeyDownEventHandler(Form1_PreviewKeyDown);
}

private void Form1_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
{
    try
    {
        MessageBox.Show(e.KeyCode.ToString() + " key pressed on " + sender.ToString());
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

private void textBox1_KeyDown(object sender, KeyEventArgs e)
       {
           MessageBox.Show(e.KeyData.ToString());
       }