D3.js how to merge my real data into a pie chart - asp.net

Question

I am new to D3 and data visualizing and I'm having some troubles loading my real data.
You'll find my code in the below sections.
Right now I have some data stored in an array, and now what I want to do is, store my actual data from my database into pie charts.
Also if I do this :
var mydata=d3.json("mydatafile");
console.log(mydata);
It shows me all the data I have retrieved from database in a promise array.
Is there any way possible I can get these data and put them in my charts?
The code for my pie chart written in D3js is below:
var aColor = [
'rgb(127, 212, 123)', //green
'rgb(240, 149, 164)', // red
'rgb(181, 174, 175)' //gray
]
var data = [{
"platform": "Yes",
"percentage": 87.00
}, //skyblue
{
"platform": "No",
"percentage": 1.00
}, //darkblue
{
"platform": "N/A",
"percentage": 17.00
}]; //orange
var svgWidth = 200,
svgHeight = 200,
radius = Math.min(svgWidth, svgHeight) / 2;
var svg = d3.select('#graph1').append("svg")
.attr("width", svgWidth)
.attr("height", svgHeight);
//Create group element to hold pie chart
var g = svg.append("g")
.attr("transform", "translate(" + radius + "," + radius + ")");
var pie = d3.layout.pie().value(function (d) {
return d.percentage;
});
var path = d3.svg.arc()
.outerRadius(80)
.innerRadius(40);
var arc = g.selectAll("arc")
.data(pie(data))
.enter()
.append("g")
.sort((a, b) => b.data.percentage - a.data.percentage);
arc.append("path")
.attr("d", path)
.attr("fill", function (d, i) { return aColor[i]; });
var label = d3.svg.arc()
.outerRadius(20)
.innerRadius(100);
arc.append("text")
.attr("transform", function (d) {
return "translate(" + label.centroid(d) + ")";
})
.attr("text-anchor", "middle")
.text(function (d) {
return +d.data.percentage;
});
<script src="https://d3js.org/d3.v3.min.js"></script>
<div id="graph1"></div>
On the other hand as per my backend, I have this project written on asp.net .net framework and I have this function which retrieves all the data on JSON format, which is cool.
public JsonResult BarChart()
{
string query = "select e.ProjectName,cyn.Name From Events e left join ConstYesNoes cyn on cyn.ID = e.ApproveId";
IEnumerable<BarChartsViewModel> ListResults = db.Database.SqlQuery<BarChartsViewModel>(query).ToList();
return Json(ListResults.Select(x => new { Name = x.Name, ApprovedId = x.ApprovedId, ID = x.ID, ProjectName = x.ProjectName }).ToList(), JsonRequestBehavior.AllowGet);
}