DirectoryInfo dir = new DirectoryInfo(@"c:\myPicutures"); //change and get your folder
        foreach (FileInfo file in dir.GetFiles())
        {
            try
            {
                this.imageList1.Images.Add(Image.FromFile(file.FullName));
            }
            catch{
                Console.WriteLine("This is not an image file");
            }
        }
        this.listView1.View = View.LargeIcon;
        this.imageList1.ImageSize = new Size(32, 32);
        this.listView1.LargeImageList = this.imageList1;
        //or
        //this.listView1.View = View.SmallIcon;
        //this.listView1.SmallImageList = this.imageList1;

        for (int j = 0; j < this.imageList1.Images.Count; j++)
        {
            ListViewItem item = new ListViewItem();
            item.ImageIndex = j;
            this.listView1.Items.Add(item);
        }