JSON data int64 type return wrong value

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ASP.NET

Ajax

MVC

JSON

hey guys

i little english, sorry :)

my sample code is that (it is asp.net mvc)

model.cs

public class TestModel
{
    public string Name { get; set; }
    public Int64 Value { get; set; }
}

controller.cs

public ActionResult Test()
{
     TestModel model = new TestModel { Name = "Test", Value = 1000000000000000001 };

     return Json(model, JsonRequestBehavior.AllowGet);
}

view.cshtml

<script type="text/javascript">
    $(function () {
        $.ajax({
            type: 'GET',
            url: "/Test/Test",
            data: {},
        }).done(function (result) {
            alert(JSON.stringify(result));
        });
    });
</script>

but alert result returns {"Name":"Test","Value":1000000000000000000}

the "Value" return 1000000000000000000 (source value is 1000000000000000001)

can you tell me solution?

thanks.