        /*
        [System.Runtime.InteropServices.DllImport("winmm.DLL", EntryPoint = "PlaySound", SetLastError = true)]
        private static extern bool PlaySound(string szSound, System.IntPtr hMod, PlaySoundFlags flags);

        [System.Flags]
        public enum PlaySoundFlags : int
        {
            SND_SYNC = 0x0000,
            SND_ASYNC = 0x0001,
            SND_NODEFAULT = 0x0002,
            SND_LOOP = 0x0008,
            SND_NOSTOP = 0x0010,
            SND_NOWAIT = 0x00002000,
            SND_FILENAME = 0x00020000,
            SND_RESOURCE = 0x00040004
        }
        */


===
            List<Person> people = new List<Person>();

            people.Add(new Person { Age = 25, FirstName = "Alex", LastName = "Johnson" });
            people.Add(new Person { Age = 23, FirstName = "Jack", LastName = "Jones" });
            people.Add(new Person { Age = 35, FirstName = "Mike", LastName = "Williams" });
            people.Add(new Person { Age = 25, FirstName = "Gill", LastName = "JAckson" });

            this.listBox1.DataSource = people;
            this.listBox1.DisplayMember = "FirstName";
            this.listBox1.ValueMember = "Age";

===
/*
class Person {

    public int Age;
    public string FirstName;
    public string LastName;

};
*/

===


        //[System.Runtime.InteropServices.DllImport("winmm.DLL", EntryPoint = "PlaySound", SetLastError = true, CharSet = CharSet.Unicode, ThrowOnUnmappableChar = true)]
        //private static extern bool PlaySound(string szSound, System.IntPtr hMod, PlaySoundFlags flags);
        //[System.Runtime.InteropServices.DllImport("C:\\vcnet_proj\\EpycsMessenger2\\skyauth4_dll.dll", EntryPoint = "_sayhello@4", SetLastError = true)]
        //private static extern bool PlaySound(string szSound, System.IntPtr hMod);
        //[DllImport("C:\\vcnet_proj\\EpycsMessenger2\\skyauth4_dll.dll", EntryPoint = "_sayhello@4", CharSet = CharSet.Unicode)]
        //private static extern bool PlaySound(System.IntPtr hMod);

===
