jQuery –  initializing Chart.js in Asp.net
//*
$(document).ready(function () {

    $("btnGeneratePieChart").on('click', function (e) {
        e.preventDefault();
        var gData = [];
        gData[0] = $("#ddlyear").val();
        gData[1] = $("#ddlMonth").val();

        var jsonData = JSON.stringify({
            gData: gData
        });
        $.ajax({
            type: "POST",
            url: "WebService.asmx/getTrafficSourceData",
            data: jsonData,
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: OnSuccess_,
            error: OnErrorCall_
        });

        function OnSuccess_(response) {
            var aData = response.d;
            var arr = [];
            $.each(aData, function (inx, val) {
                var obj = {};
                obj.color = val.color;
                obj.value = val.value;
                obj.label = val.label;
                arr.push(obj);
            });
            var ctx = $("#myChart").get(0).getContext("2d");
            var myPieChart = new Chart(ctx).Pie(arr);
        }

        function OnErrorCall_(response) {}
        e.preventDefault();
    });
});
//*