C#

Task.Factory.StartNew(delegate
{
     for(int iJJ = 0; iJJ < 100000; iJJ++)
     {
       //DO somework...
     }

});

using System;
using System.Drawing;
using System.Windows.Forms;

namespace Random_Image_Generator
{
    public partial class mainWindow : Form
    {
        int timeKeeper;
        Bitmap[] images = new Bitmap[30];
        
        
        public mainWindow()
        {
            InitializeComponent();
            timer1.Interval = 1000;
            images[0] = new Bitmap(Bitmap.FromFile("0.bmp"));
            images[1] = new Bitmap(Bitmap.FromFile("1.bmp"));
            images[2] = new Bitmap(Bitmap.FromFile("2.bmp"));
            images[3] = new Bitmap(Bitmap.FromFile("3.bmp"));
            images[4] = new Bitmap(Bitmap.FromFile("4.bmp"));
            images[5] = new Bitmap(Bitmap.FromFile("5.bmp"));
            images[6] = new Bitmap(Bitmap.FromFile("6.bmp"));
            images[7] = new Bitmap(Bitmap.FromFile("7.bmp"));
            images[8] = new Bitmap(Bitmap.FromFile("8.bmp"));
            images[9] = new Bitmap(Bitmap.FromFile("9.bmp"));
            images[10] = new Bitmap(Bitmap.FromFile("10.bmp"));
            images[11] = new Bitmap(Bitmap.FromFile("11.bmp"));
            images[12] = new Bitmap(Bitmap.FromFile("12.bmp"));
            images[13] = new Bitmap(Bitmap.FromFile("13.bmp"));
            images[14] = new Bitmap(Bitmap.FromFile("14.bmp"));
            images[15] = new Bitmap(Bitmap.FromFile("15.bmp"));
            images[16] = new Bitmap(Bitmap.FromFile("16.bmp"));
            images[17] = new Bitmap(Bitmap.FromFile("17.bmp"));
            images[18] = new Bitmap(Bitmap.FromFile("18.bmp"));
            images[19] = new Bitmap(Bitmap.FromFile("19.bmp"));
            images[20] = new Bitmap(Bitmap.FromFile("20.bmp"));
            images[21] = new Bitmap(Bitmap.FromFile("21.bmp"));
            images[22] = new Bitmap(Bitmap.FromFile("22.bmp"));
            images[23] = new Bitmap(Bitmap.FromFile("23.bmp"));
            images[24] = new Bitmap(Bitmap.FromFile("24.bmp"));
            images[25] = new Bitmap(Bitmap.FromFile("25.bmp"));
            images[26] = new Bitmap(Bitmap.FromFile("26.bmp"));
            images[27] = new Bitmap(Bitmap.FromFile("27.bmp"));
            images[28] = new Bitmap(Bitmap.FromFile("28.bmp"));
            images[29] = new Bitmap(Bitmap.FromFile("29.bmp"));
        }
        
        




        private void timer1_Tick(object sender, EventArgs e)
        {
            if (timeKeeper == 30)
            {
                nextImage();
                timeKeeper = 0;
            }
            else
            {
                timeKeeper++;
            }
            
        }

        private void button1_Click(object sender, EventArgs e)
        {
            timer1.Start();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            timer1.Stop();
        }

        private void nextImage()
        {
            int randNum = RandomNumber(0, 29);
           
            // some way to check if image was already displayed goes here
            imageArea.Image = images[randNum];
        
        }

        private int RandomNumber(int min, int max)
        {
            Random random = new Random();
            return random.Next(min, max);
        }

    }


    }