How to parse JSON list of string on ajax return?

Question

I have a simple ajax call which returns a serialised list of strings. This is great and I can get the data back. However I'm simply trying to perform an alert on each item in the list. However, I just keep getting back single characters from the list instead. For example if it returned a list with one item in it called "Hello". It would alert "H", "E", "L" etc. Can someone help me change this so it alerts the full string?

The response received back is very similar to the text above. If the c# variable userList returns a list of strings with just "Andrew" in it. The JQuery will alert "A", "N", "D" etc. If that isn't clear, just let me know.

Thanks

C#

[HttpPost]
        public string GetUserList(string Role) {
            List<string> UserList = new List<string>();
            UserList = Roles.GetUsersInRole(Role).ToList();
            return JsonConvert.SerializeObject(UserList);
        }

JQuery

   $('#allRolesDD').change(function () {
        $.ajax({
            method: "POST",
            url: "./GetUserList",
            data: { Role: $(this).val() }
        })
        .done(function (data) {
            $('.roleDD').empty();
            for (i = 0; i < data.length; i++) {
                alert(data[i]);
            }
            console.log("Passed 4");
        })
        .fail(function () {
            console.log("Failed 4");
        })
    });

Answer 1

you can change c# code and jquery like below:

C#

[HttpPost]
    public JsonResult GetUserList(string Role) {
        List<string> UserList = new List<string>();
        UserList = Roles.GetUsersInRole(Role).ToList();
        return Json(UserList, JsonRequestBehavior.AllowGet);
    }

JQuery

  $('#allRolesDD').change(function () {
$.ajax({
    method: "POST",
    url: "./GetUserList",
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    data: { Role: $(this).val() }
})
.done(function (data) {
    $('.roleDD').empty();
    for (i = 0; i < data.length; i++) {
        alert(data[i]);
    }
    console.log("Passed 4");
})
.fail(function () {
    console.log("Failed 4");
})
});