Running another program from your own.

   
  


using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Diagnostics;


public class MainClass {
    public static void Main() {
        Process.Start("notepad.exe", "");
        Process.Start("sol.exe", "");
    }
}