Dynamic Data with Morris Graphs

I created Jsfiddle i want that output.
http://jsfiddle.net/Y3Cf9/

My Json format is Correct i think so

My Function in C# for generating Json String.
public JsonResult barc()
{

var ab = 0;
var ba = 0;
StringBuilder resul = new StringBuilder();
var query = from o in db.report_mst
group o by o.test_id
into g
select new
{
Employee = g.Key,
Amount = g.Count()
};
resul.Append("[");

foreach (var q in query)
{ ab = q.Employee;
ba = q.Amount;
resul.Append("{ \"y\": \"" + ab + "\", \"a\": \"" + ba + "\" },");

}
resul.Remove(resul.Length - 1, 1);
resul.Append("]");

return Json(resul.ToString(), JsonRequestBehavior.AllowGet);
}


My Javascript..
<script type="text/javascript">
var anc;
$.ajax({
url: '/Report/barc/',
type: "POST",
dataType: "json",
success: function (resul) {

anc = JSON.stringify(resul);

alert(resul);


}


});
Morris.Bar({
element: 'bar-example',
data: anc,
// data: [ { a : 100,
// y : 2006
// },
//{ "a" : 75,
// "y" : 2007
//},
//{ "a" : 50,
// "y" : 2008
//},
//{ "a" : 75,
// "y" : 2009
//},
//{ "a" : 50,
// "y" : 2010
//},
//{ "a" : 75,
// "y" : 2011
//},
//{ "a" : 100,
// "y" : 2012
//}
// ],
xkey: 'y',
ykeys: ['a'],
labels: ['No of times']
});
</script>

Please help