给button添加UAC的小盾牌图标

Sample Code：

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

        private void button1_Click(object sender, EventArgs e)
        {
            RestartElevated();
        }

        static internal bool IsAdmin()
        {
            WindowsIdentity id = WindowsIdentity.GetCurrent();
            WindowsPrincipal p = new WindowsPrincipal(id);
            return p.IsInRole(WindowsBuiltInRole.Administrator);
        }

        static internal void AddShieldToButton(Button b)
        {
            b.FlatStyle = FlatStyle.System;
            SendMessage(b.Handle, BCM_SETSHIELD, 0, 0xFFFFFFFF);
        }

        [DllImport("user32")]
        public static extern UInt32 SendMessage
            (IntPtr hWnd, UInt32 msg, UInt32 wParam, UInt32 lParam);

        internal const int BCM_FIRST = 0x1600; //Normal button
        internal const int BCM_SETSHIELD = (BCM_FIRST + 0x000C); //Elevated button

        internal static void RestartElevated()
        {
            ProcessStartInfo startInfo = new ProcessStartInfo();
            startInfo.UseShellExecute = true;
            startInfo.WorkingDirectory = @"d:\";
            startInfo.FileName = "ConsoleApplication4.exe";
            startInfo.Verb = "runas";
            try
            {
                Process p = Process.Start(startInfo);
            }
            catch (System.ComponentModel.Win32Exception ex)
            {
                return;
            }

            Application.Exit();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            if (!IsAdmin())
            {
                this.Text += " (Standard)"; //Unnecessary
                AddShieldToButton(this.button1); //Important
            }
        }
    }