How to avoid on displaying repeated data on auto-complete text-box from database table MVC 4?

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Ajax

jQuery

JSON

MVC4

am using autocomplete ajax function on text-box. till what i have done is. using ajax auto-complete function it will fetch all data from table columns.

Example :

In my columns U.S.A, Canada,London ,u.s.a,India,china,London,u.s.a, etc When i type on textbox as u.s.a. it fetch u.s.a,u.s.a,u.s.a,

Problem is,

i don't need to fetch repeated data when i type u.s.a

it should return u.s.a

not u.s.a,u.s.a,u.s.a,

Controller

public JsonResult GetLocation(string term)
        {
            SYTEntities db = new SYTEntities();
            List<string> Location = new List<string>();
            {
                Location.AddRange(db.tblAddresses.Where(x => x.City.StartsWith(term))
                       .Select(y => y.City).ToList());
                Location.AddRange(db.tblAddresses.Where(x => x.State.StartsWith(term))
                      .Select(y => y.State).ToList());
            }
            return Json(Location, JsonRequestBehavior.AllowGet);
        }

View

<input type="search" name="txtLocation" id="txtLocation" value="@Session["location"]" placeholder=" City or State">

    <script type="text/javascript">
        $(document).ready(function () {
            $("#txtValue").autocomplete({
                source: '@Url.Action("Getbusiness")',
                minLength: 1
            });
            $("#txtLocation").autocomplete({
                source: '@Url.Action("GetLocation")',
                minLength: 1
            });
        });
    </script>