how can i randomize the spot of an object in a game

i have a little shooting game . after the user shoots the target and hits it he goes to the next level. now i have a button on the form that clicking it takes you to the next level . how can i change the location of the object ( a shape control ) randomly when i click the button .
thankyou

VB Code:

Shape1.Top = ((Form1.ScaleHeight - Shape1.Height) * Rnd)
Shape1.Left = ((Form1.ScaleWidth - Shape1.Width) * Rnd)

Try this ;)