Shutdown program in c#

Question

I want to write a program, which is shut down, or restart the pc.

In the form, i have a datetimepicker tool, and 2 button. So, my question is, which code can i shut down the pc, and how can i read the selected time from the datetimepicker ( which is set to time ( h/m ) ) ? 

The code is currently:

namespace WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

        }

        private void dateTimePicker1_ValueChanged(object sender, EventArgs e)

        {

            dateTimePicker1.Format = DateTimePickerFormat.Short;

            dateTimePicker1.Value = DateTime.Today;

        }

        private void button1_Click(object sender, EventArgs e)

        {

            DateTime iDate;

            iDate = dateTimePicker1.Value;

            MessageBox.Show("A kiválasztott dátum: " + iDate);

        }

        private void button2_Click(object sender, EventArgs e)

        {

            DateTime iDate;

            iDate = dateTimePicker1.Value;

            MessageBox.Show("A kiválasztott dátum: " + iDate);

        }

    }

}