COM in c#

Com: =Microsoft Shell Controls and Automation

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using Shell32;

namespace WindowsFormsApplication1

{

    public partial class com : Form

    {

        public com()

        {

            InitializeComponent();

        }

        private void com_Load(object sender, EventArgs e)

        {

        }

        ShellClass sc = new ShellClass();

        private void button1_Click(object sender, EventArgs e)

        {

            sc.ShutdownWindows();

        }

        private void button2_Click(object sender, EventArgs e)

        {

            sc.RefreshMenu();

        }

        private void button4_Click(object sender, EventArgs e)

        {

            sc.SetTime();

          

        }

        private void button5_Click(object sender, EventArgs e)

        {

            sc.FindComputer();

            sc.FindFiles();

            sc.FileRun();

            sc.Help();

            sc.MinimizeAll();

            sc.ControlPanelItem("C://");

            sc.EjectPC();

            sc.GetHashCode();

            sc.Windows();

            sc.Suspend();

            sc.UndoMinimizeALL();

            sc.TrayProperties();

        }

    }

}