.NET ขอแนวทางการเขียนโปรแกรมบนมือถือประเภท Smart Device Application (C#)

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

namespace SmartDeviceProject
{
    public partial class frmMain : Form
    {
        // By https://www.thaicreate.com (mr.win)//

        public frmMain()
        {
            InitializeComponent();
        }

        private void btnHome_Click(object sender, EventArgs e)
        {
            frmHome f = new frmHome();
            f.Show();
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            if(MessageBox.Show("Are you sure to exit?", "Confirm.", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1) == DialogResult.Yes)
            {
                Application.Exit();
            }
        }

        private readonly byte VK_OFF = 0xdf;
        private readonly byte KEYEVENTF_KEYUP = 0x2;

        [System.Runtime.InteropServices.DllImport("coredll.dll", SetLastError = true)]
        public static extern void keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo);

        private void btnShutdown_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("Are you sure to shutdown?", "Confirm.", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1) == DialogResult.Yes)
            {
                keybd_event(VK_OFF, 0, 0, 0);
                keybd_event(VK_OFF, 0, KEYEVENTF_KEYUP, 0);
            }
        }

    }
}