How can i make my pictures display in sequence along with my videos?

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace ExpertsExchange
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();            
        }       

        private void fileButton_Click(System.Object sender, System.EventArgs e)
        {
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                foreach (string file in openFileDialog1.FileNames)
                {
                    txtBrowse.Text += file+",";
                }
                
                this.openFileDialog1_FileOk(this, null);
            }
        }

        private void openFileDialog1_FileOk(object sender, CancelEventArgs e)
        {
            pictureBox1.Image = null;
            this.Activate();
            string[] files = openFileDialog1.FileNames;

            // Open each file and display the image in pictureBox1.
            // Call Application.DoEvents to force a repaint after each
            // file is read.        
            foreach (string file in files)
            {
                if (pictureBox1.Image != null)
                {
                    // Call Sleep so the picture is briefly displayed, 
                    //which will create a slide-show effect.
                    System.Threading.Thread.Sleep(1000);
                }

                System.IO.FileInfo fileInfo = new System.IO.FileInfo(file);
                System.IO.FileStream fileStream = fileInfo.OpenRead();
                pictureBox1.Image = System.Drawing.Image.FromStream(fileStream);
                Application.DoEvents();
                fileStream.Close();                
            }            
        }    
    }
}

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