If you read the article to its end, you'll see that the code to make the chess board is under the heading: "Another noteworthy codesample".
If that doesn't make sense, just ask again :).

Kind regards - Jakob

You could solve it this way:
- have a list of all selectable items in the market (you probably already have this)
- when the user clicks the mouse, run through the list of items till you find the item hit (or none, in which case you do nothing :))
- if the user clicked an item:
- toggle the item's "Selected" property (something you need to code yourself)
- maybe alter the drawing of the items when they are selected. Put a border on them, or something like that?
- have a list of selected items which you add the selected items to when you select them, and remove the items from when you deselect them
- if the user starts dragging (moving the mouse while the mousebutton is down on top of an item), in every Update() move all the items in the "selected list" the same amount as the mouse has moved since last Update (store the old mouse position at the end of every Update(), so you can calculate the change in movement).
- when the user releases the mousebutton, check to see where that is, and if it is in an "action area" (e.g. Shopping basket, sell area, etc.) then perform the needed action. If releasing the items in an invalid location should result in the items returning to their original position, then you will need to store their original position somewhere as well

Note: if your items can overlap you will need to search down through them for mouseclicks from the opposite end of the list as the direction you are drawing them in. So the last drawn (the ones visually on top) will be the first to be hit with the mouse.

Hope this helps!

Kind regards - Jakob

it's like a mini market game, there are some goods... i choose the goods and put it in the basket...
how can i make the code like that?
thanks before... 😀

How would you like to select those multiple images?
Clicking on each of them to add them to the selected images, or drag a selection rectangle around them?
Write a bit more and I'll see if I can come up with some help for you

Kind regards - Jakob

thanks for your help

/Jake