[visualization-api] Duplcate values in piechart.

[vivek krishna]

"The Piechart created using the below code displays duplicate values 
randomly, on refreshing the chart gets corrected."
Want to understand the problem and solution thereof...

Code :- 
<script type="text/javascript" 
src="https://www.gstatic.com/charts/loader.js";></script>
<script type="text/javascript" src="https://www.google.com/jsapi";></script>
<script 
src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js";></script>

$.ajax({

type: "POST",
dataType: "json",
contentType: "application/json",
url: '@Url.Action("VisualizeBookingStatus", "View")',
success: function (result) {

// Load the Visualization API and the corechart package.
google.charts.load('current', { 'packages': ['corechart'] });

// Set a callback to run when the Google Visualization API is loaded.
google.charts.setOnLoadCallback(function () {
drawChart(result);
});

}

});

});

function drawChart(result) {

var data = new google.visualization.DataTable();

data.addColumn('string', 'Agency');
data.addColumn('number', 'Booked');

var dataArray = [];


$.each(result, function (i, obj) {
dataArray.push([obj.agency, obj.booking_count]);

});


data.addRows(dataArray);

var chartoptions = {
'title': 'Booking-Agencywise',
chartArea: { width: 500, height: 400 },
is3D: true
};

var chart = new 
google.visualization.PieChart(document.getElementById('piechart'));
chart.draw(data, chartoptions);

}

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