How to drag multiple images from button s into picturebox

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C#3.5

I am developing a c# windows application in which i want to drag 4 pictures from 4 buttons into a picturebox. i can drag and drop pictures into a picturebox but my problem is that they all pile in one location. i want them to be arranged either vertically or horizontally. Below is my picturebox dragdrop event method.

private void picBox_DragDrop(object sender, DragEventArgs e)
{
    PictureBox p1 = (PictureBox)sender;
    Graphics g = p1.CreateGraphics();


    g.DrawImage((Image)e.Data.GetData(DataFormats.Bitmap), new Point(0, 0));



}