I have a grid with a custom toolbar button to do a "global" update to the grid items. The Action is a normal MVC controller that returns a JsonResult. The action works correctly, but I'm not sure how to correctly handle the response - IE is asking if I want to download or open the JSON response. What I need to do is check the response for success, and refresh the grid or display an error message. How can I wire this up? Apologies if there's an answer already - I've searched, but can't seem to find anything.