[STAThread]
private static void newInstance() {
 
//the following code also exists in Main() method
 
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());             
        }

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;
 
namespace daniweb
{
  public partial class frmProcess : Form
  {
    public frmProcess()
    {
      InitializeComponent();
    }
 
    private void button1_Click(object sender, EventArgs e)
    {
      Process.Start(Application.ExecutablePath);
    }
  }
}