Detectar tecla tab c sharp

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace TabTextbox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void textBox1_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
        {
            if (e.KeyData == Keys.Tab)
            {
                MessageBox.Show("Tab");
                e.IsInputKey = true;
            }
            if (e.KeyData == (Keys.Tab | Keys.Shift))
            {
                MessageBox.Show("Shift + Tab");
                e.IsInputKey = true;
            }
        }
    }
}