c# - Ajax returning error 401 ("Unauthorized") in jQuery -

newbie here. have issue ajax. situation this: have multiselect dropdownlist of managements, , want bring managers managements, , attach them on dropdownlist (i did not finish that). here, call function , send selected values:

    getmanagersbymanagement($("#ddlmanagement").val()); 

for now, want return data getmanagers, on jsongriddataprovider.svc.

    function getmanagersbymanagement(managementids) {             $.ajax({                 type: "get",                 contenttype: "application/json; charset=utf-8",                 url: "../../jsongriddataprovider.svc/getmanagers",                 data: { 'id': json.stringify(managementids) },                 datatype: "json",                 success: function (data) {                     $.jstorage.set($rpt.pageidentifier + "-managers", json.stringify(data));                     alert($.jstorage.get($rpt.pageidentifier + "-managers"));                 },                 error: function (jqxhr, textstatus, errorthrown) {                     alert("fail");                 }             }); 

this getmanagers function >>

[operationcontract]         [webget(responseformat = webmessageformat.json)]         public list<user> getmanagers(long[] managementids)         {             ilist<user> alluserlist = (new userbiz()).getallbyuserbytypeandstate(2, 3);             list<user> list = (from v in alluserlist v.active == true orderby v.fullname ascending select v).tolist();             var finaluserlist = (from item in list                                  let samemanlist = (from v in item.management                                                     managementids.contains(v.id)                                                     select v.id).distinct().tolist()                                  samemanlist.count > 0                                  select item).tolist();             return finaluserlist;         } 

but when instead of going getmanagers function, returns "error 401" ("unauthorized"). idea why happening?

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edit

thank replies. that, checked the problem not javascript function nor ajax configuration, the getmanagers() function (or configuration i'm missing). ideas?

try adding [httppost] attribute method calling. , change type: "get" type: "post" in script. maybe help. worked me.