internet explorer - IE prompts to open or save json result from server

Question

Internet explorer in compatibility mode gets the data from the server in an ajax callback method, and pops-up a dialog if I want to save the data or open. How to get rid of that?

client says:

$.ajax({
        type:'POST',
        data: $("#UIdlgHolder > form").serialize(),
        url: $("#UIdlgHolder > form").attr("action"),
        success: function (data, textStatus, jqXHR) {
            {
                alert(data.message);
            }
}

server answers:

return new JsonResult { Data = new { result = false, message = "Yay!" } };

Answer 1

Even though it's not supposedly the correct way, setting the content type to text/html made IE deal with this correctly for me:

return Json(result, "text/html");

Works in all the version that F12 tools gives you in IE9.