How use OLE In Visual Studio 2010 C# ?

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 System.Diagnostics;
using System.Threading;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //Use excel.exe for excel and notepad.exe for notepad
            Process p = Process.Start("powerpnt.exe"); 
            Thread.Sleep(500); // Allow the process to open it's window
        }
    }
}