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I am making an application, that when i click a button, some bitmap pictures load randomly from a specific location and be shown in a pictureBox ! How to do it ?

my code is already like this :

using System;
using System.Threading;
using System.IO;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace MLP_OCR
    public partial class Form1 : Form
        int index = -1;
        List<Image> images;

        public Form1()
            images = new List<Image>();
            DirectoryInfo di = new DirectoryInfo(@"F:\bmp"); // give path
            FileInfo[] finfos = di.GetFiles("*.bmp", SearchOption.AllDirectories);
            foreach (FileInfo fi in finfos)

        private async void trainButton_Click(object sender, EventArgs e)
            for (index=-1; index < 1699; index++)
                if (index < 0 || index >= images.Count)
                    index = 0;
                samplePictureBox.Image = images[index];
                await Task.Delay(2);

Updated 26-Feb-19 6:22am

If you're using the Image route, you can create a list of images with List images = new List(); and add each image to it with images.Add(image); for each image.

For Images:

Random random = new Random();
samplePictureBox.Image = images[random.Next(0, images.Count - 1)];
Dark Sauron 6-Nov-13 16:18pm
Thank you, that worked like a charm :-X
Try this:
private Random rand = new Random();
public void GetRandomImage()
    string[] files = Directory.GetFiles(@"D:\Temp\", "*.jpg", SearchOption.AllDirectories);
    myPictureBox.Image = Image.FromFile(files[rand.Next(files.Length)]);
  1. Create a list of image names (you may use the DirectoryInfo.EnumerateFiles method[^] in order to accomplish it).
  2. Pick a random number r, between 0 and (List.Count-1).
  3. Load and show the image corrensponding to the item r of the list.
  4. Wait for button click
  5. Go to point 2.

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