private void button3_Click(object sender, EventArgs e) { Random R = new Random(); int W = (int)numericUpDown1.Value; int H = (int)numericUpDown2.Value; Bitmap cur = new Bitmap(W, H); for (int i = 0; i < (int)numericUpDown3.Value; i++) { cur = cur.AddToTopRandom(items[R.Next(items.Count - 1)]); } pictureBox1.Image = cur; }