how to run lots of pictures in 1 picture box randomly?

DirectoryInfo di;
List<FileInfo> images= new List<FileInfo>();
string dirpath = @"C:\Images"; // set your image directory path
int timeTemp = 0;
BackgroundWorker backgroundWorker = new BackgroundWorker
{
    WorkerReportsProgress = true,
    WorkerSupportsCancellation = true
};

di = new DirectoryInfo(dirpath);

GetImagesOfType("*.jpg");//will add .jpg files to list - add other file types below
//GetImagesOfType("*.png"); 

backgroundWorker.DoWork += BackgroundWorkerOnDoWork;
backgroundWorker.ProgressChanged += BackgroundWorkerOnProgressChanged;
ChangePicture();
if (!backgroundWorker.IsBusy)
   backgroundWorker.RunWorkerAsync();

private void BackgroundWorkerOnProgressChanged(object sender, ProgressChangedEventArgs e)
{
   progressBar1.Value = e.ProgressPercentage;
}

private void BackgroundWorkerOnDoWork(object sender, DoWorkEventArgs e)
{
   BackgroundWorker worker = (BackgroundWorker)sender;
   while (!worker.CancellationPending)
   {
    Thread.Sleep(1000);
    if (timeTemp < 100) timeTemp += 10;
    else
    {
       timeTemp = 0;
       ChangePicture();
    }
    worker.ReportProgress(timeTemp);
   }
}

public void ChangePicture()//to change pics
        {
            Random d = new Random();
            int index = d.Next(0, images.Count);
            FileInfo item = images.ElementAt(index);
            pictureBox1.Image = Image.FromFile(item.FullName);
        }

public void GetImagesOfType(string type)// will read all the images of specified TYPE from the source
       {
           FileInfo[] Img = di.GetFiles(type);
           foreach (FileInfo im in Img)
               images.Add(im);
       }