.net - Drag and drop main form to reposition it on the screen, on a different thread or backgroundworker -


i have winforms application , @ times main thread extremely busy. when main thread busy, want user able drag , drop main form (using pbappheader control @ top of form), can reposition main form on screen. since main thread extremely busy @ times, moving main form slow , jerky.

how run following subs on different thread or backgroundworker moving main form smooth? or there better way this?

dim drag boolean dim mousex integer dim mousey integer  private sub pbappheader_mousedown(byval sender object, byval e system.windows.forms.mouseeventargs) handles pbappheader.mousedown     drag = true 'sets variable drag true.     mousex = windows.forms.cursor.position.x - me.left 'sets variable mousex     mousey = windows.forms.cursor.position.y - me.top 'sets variable mousey end sub  private sub pbappheader_mousemove(byval sender object, byval e system.windows.forms.mouseeventargs) handles pbappheader.mousemove     'if drag set true move form accordingly.     if drag         me.top = windows.forms.cursor.position.y - mousey         me.left = windows.forms.cursor.position.x - mousex     end if end sub  private sub pbappheader_mouseup(byval sender object, byval e system.windows.forms.mouseeventargs) handles pbappheader.mouseup     drag = false 'sets drag false, form not move according code in mousemove end sub

in case runs similar situation, works well.

public const wm_nclbuttondown integer = &ha1 public const ht_caption integer = &h2  private sub pbappheader_mousedown(byval sender object, byval e system.windows.forms.mouseeventargs) handles pbappheader.mousedown     if e.button = mousebuttons.left         nativemethods.releasecapture()         nativemethods.sendmessage(handle, wm_nclbuttondown, ht_caption, 0)     end if end sub  <comvisible(true)> friend class nativemethods      <dllimport("user32.dll", setlasterror:=true, charset:=charset.auto)> _     public shared function sendmessage(byval hwnd intptr, byval msg uinteger, byval wparam intptr, byval lparam intptr) intptr     end function      <dllimportattribute("user32.dll")> _     public shared function releasecapture() boolean     end function  end class

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