public partial class Form1 : Form
    {
        private void button1_Click(object sender, EventArgs e)
        {
            switch (new Random().Next(3))
            {
                case 0:
                    label1.Text = "1";
                    pictureBox1.Image = WindowsFormsApplication1.Properties.Resources._1;
                    break;
                case 1:
                    label1.Text = "2";
                    pictureBox1.Image = WindowsFormsApplication1.Properties.Resources._2;
                    break;
                case 2:
                    label1.Text = "3";
                    pictureBox1.Image = WindowsFormsApplication1.Properties.Resources._3;
                    break;
            }
        }
    }

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using System;
public class t : MonoBehaviour {
public Text tg;
public Text tt;

TimeSpan w ;
public void Start()
{
w = new TimeSpan (0, 2, 1);
Run ();
}
// Use this for initialization
public void Stop()

{
CancelInvoke ();
}
public void Run()
{
w = w.Subtract (new TimeSpan (0, 0, 1));

tg.text = w.Minutes + ":" + w.Seconds;
Invoke("Run",1);
}
// Update is called once per frame
void Update () {

tt.text = DateTime.Now.ToString ("hh/MM/ss");
}
}