datagridview event ตรวจสอบการกดปุ่ม ว่ากดปุ่มใด ระหว่างพิมพ์ข้อมูลใน cell

   public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
            this.dataGridView1.EditingControlShowing += new System.Windows.Forms.DataGridViewEditingControlShowingEventHandler(this.dataGridView1_EditingControlShowing);
            this.dataGridView1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.dataGridView1_KeyDown);
            this.dataGridView1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.dataGridView1_KeyPress);
            this.dataGridView1.KeyUp += new System.Windows.Forms.KeyEventHandler(this.dataGridView1_KeyUp);
        }

        private void dataGridView1_KeyDown(object sender, KeyEventArgs e)
        {
            richTextBox1.Text += "\n dataGridView1_KeyDown " + e.KeyCode;

        }

        private void dataGridView1_KeyPress(object sender, KeyPressEventArgs e)
        {
            richTextBox1.Text += "\n dataGridView1_KeyPress " + e.KeyChar;
        }

        private void dataGridView1_KeyUp(object sender, KeyEventArgs e)
        {
            richTextBox1.Text += "\n dataGridView1_KeyUp " + e.KeyCode;
        }

        private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            TextBox txt = e.Control as TextBox;
            txt.PreviewKeyDown += new PreviewKeyDownEventHandler(txt_PreviewKeyDown);
        }
        void txt_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
        {
            richTextBox1.Text += "\n txt_PreviewKeyDown " + e.KeyCode;
        }

    }