User right clicks square on gui to delete; Not working correctly c# -

my winforms program has bunch of boxes flying every way basic collision detector. user can add boxes wherever left click (so overlap quite often).

the issue: whenever user right-clicks square, squares within (based on center of other squares) one-square area supposed removed. sadly, seems work on top left of square. no right click in lower half, nor right half results in removal. on top of that, deletes farther , farther left should. code:

        if (e.button == mousebuttons.right)         {             foreach (mysquare square in squarelist)             {                 if (((mouseeventargs)e).x - (dimensions / 2) <= square.xposition & square.xposition <= ((mouseeventargs)e).x + (dimensions / 2))                 {                     if (((mouseeventargs)e).y - (dimensions / 2) <= square.yposition & square.yposition <= ((mouseeventargs)e).y + (dimensions / 2))                     {                         deletionlist.add(square);                     }                 }             }              foreach (mysquare square in deletionlist)             {                 squarelist.remove(square);                 counter--;             }         } 

where "dimensions" equal 20 (this can changed, initial value).

where have gone wrong?

edit: appclay, know based on top left corner, not center, which, frankly, makes quite bit of sense. in case in future cares, working code:

        if (e.button == mousebuttons.right)         {             foreach (mysquare square in squarelist)             {                 if (((square.xposition <= ((mouseeventargs)e).x & ((mouseeventargs)e).x - square.xposition <= dimensions)))                 {                     if (((mouseeventargs)e).y - dimensions <= square.yposition & square.yposition <= ((mouseeventargs)e).y)                     {                         deletionlist.add(square);                     }                 }             }              foreach (mysquare square in deletionlist)             {                 squarelist.remove(square);                 counter--;             }         }