I'm using Asp.Net-Mvc, I have this method in my controller:

    [AcceptVerbs(HttpVerbs.Post)]    
    public ActionResult LinkAccount(string site, object id)
    {
        return this.Json(id);
    }

Here's the ajax method that calls it:

$.post("/Account/LinkAccount", { site: "Facebook", 
                               id: FB.Facebook.apiClient.get_session().uid },
        function(result) {
            alert(result); 
        }, "json"
    );

returning this.Json(id); makes the alert work... it alerts 7128383 (something similar to that).

but if I change this.Json(id) to this.Json(Conver.ToInt64(id)); the alert does not fire...

Any idea of why I can't convert an object received from an object to a long?

I already know changing the LinkAccount method to accept a long instead works just fine. It's just I need it as an object because some other sites I'm linking up have strings for id's rather than longs.

UPDATE: I tried running the code on localhost so I could set a breakpoint. First I changed the line return this.Json(Convert.ToInt64(id)); to long idAsLong = Convert.ToInt64(id));. Here's what the debugger is telling me:

• When I hover over id it says: "id | {string[1]}"
  and when I press the plus button is shows: "[0] | '7128383'"

• When I hover over idAsLong, it says: "idAsLong | 0"

Why isn't it converting it properly?