This drops a picturebox straight down and has an if/then statement if hit's the bottom
vb Code:
  1. PictureBox1.Location = New Point(PictureBox1.Location.X, PictureBox1.Location.Y + 1)
  2.         If PictureBox1.Bounds.Bottom > Me.Bounds.Bottom Then
  3.             'It's hit the bottom
  4.         Else
  5.             'It didn't hit the bottom
  6.         End If