<script type="text/javascript">
  google.charts.load("current", {packages:["corechart"]});
  google.charts.setOnLoadCallback(drawChart);
   var str = '<%= JSNstring %>';     //returned string from C#.


  var res= str.replace(/""/g,"'");
  res=res.replace(/"/g,"'");
  //
  var ss=[res];
  document.write(ss);    //the output of this is:

function drawChart() {
    var data = google.visualization.arrayToDataTable(ss);

    var options = {
      title: 'My Daily Activities',
      pieHole: 0.4,
    };

    var chart = new google.visualization.PieChart(document.getElementById('donutchart'));
    chart.draw(data, options);
  }
</script>