GUI Buttons and game objects?

I am having trouble trying to relate the GUI buttons with the game objects. I have a grid of 25 x 14 buttons which i need to drag and drop game objects in. I have the objects dragging and going back to its original position but i need them to stick to where the buttons are. Any suggestions?

Here's a hint: Check out the various Camera functions, such as WorldToScreenPoint() and ScreenToWorldPoint(). (These will help you get the positions of the in-game objects and the GUI controls into the same space.)

My thing is i know how to get the position of the gameobject, but how do i get the position of a grid of buttons that each have there own position using the Worldtoscreenpoint() and ScreenToworldPoint()? Please can you give me a way to implement this?

Maybe someone else will provide a more detailed reply, but in short, if you use the GUI functions and specify the rects for the controls, then you already know where they are in screen space. You can then use WorldToScreenPoint() to get the object position into screen/GUI space (you might have to subtract the y value from the screen height - I can't remember for sure), and check to see if the point is in any of the control rectangles.