c# - How to place a windows form in screen coords and close it on command? -

i working on c# console program on windows move window, part of trying create transparent box @ target destination give user visual confirmation of new location. facing 2 main problems:

1. i want place form in screen coordinates
2. i want able close window after user has confirmed decision.

currently have code in library console client calling this:

    public static void createbox(rect rectangle)     {         form f = new form();         f.name = boxname;         f.backcolor = color.blue;         f.formborderstyle = formborderstyle.none;         f.bounds = new system.drawing.rectangle(rectangle.left, rectangle.top, rectangle.right - rectangle.left, rectangle.bottom - rectangle.top);         f.topmost = true;         f.opacity = 0.5;          application.enablevisualstyles();         task.run(() => application.run(f));     } 

and after searching questions on here have come attempt close form later:

    public static void removebox()     {         form f = application.openforms[boxname];          if (f != null)         {             f.close();         }     } 

this throwing exception coming different thread, how can close window, , how can place in screen coordinates should go?

edit:

i using attempt find box move/close unsuccessfully:

    public static void createbox(rect rectangle)     {         form f = new form();         f.name = boxname;         f.backcolor = color.aliceblue;         f.formborderstyle = formborderstyle.none;         f.topmost = true;         f.opacity = 0.3;          application.enablevisualstyles();         task.run(() =>         {             application.run(f);         });          movebox(rectangle);     }      public static void removebox()     {         intptr hwnd = findbox(new timespan(0, 0, 1));         var proc = process.getprocesses().where(p => p.handle == hwnd).single();         if (proc == null)         {             return;         }          proc.kill();     }      public static void movebox(rect rect)     {         intptr hwnd = findbox(new timespan(0, 0, 1));         movewindow(hwnd, rect);     }      private static intptr findbox(timespan timeout)     {         datetime time = datetime.now;         intptr hwnd = intptr.zero;          while(datetime.now < time.add(timeout) || hwnd != intptr.zero)         {             hwnd = findwindowbycaption(intptr.zero, boxname);         }          return hwnd;     } 

issues this:

1. i can't let findbox call take long @ because goal make box appear , snap windows them user drags them , needs move move around desktop.

2. the p.handle == hwnd check in removebox function throws , access denied exception.

if want working put: form.checkforillegalcrossthreadcalls = false;

into constructor, not recommend however, since make whole form no longer thread safe.