private void pictureBox1_MouseDown(object sender, MouseEventArgs e) { var img = pictureBox1.Image; if (img == null) return; if (DoDragDrop(img, DragDropEffects.Move) == DragDropEffects.Move) { pictureBox1.Image = null; } } public Form1() { InitializeComponent(); pictureBox1.MouseDown += pictureBox1_MouseDown; pictureBox2.AllowDrop = true; pictureBox2.DragEnter += pictureBox2_DragEnter; pictureBo..