Add User Control to the web page.

Open the web page in this case Default.aspx, and follow the instructions bellow:

1. Register HighchartsControl.
   

   <%@ Register TagPrefix="hc" TagName="Chart" Src="~/Controls/HighchartsControl.ascx" %>

2. Include required Javascript files.
   

   
   <script src="https://code.highcharts.com/highcharts.js"></script>
   <script src="https://code.highcharts.com/modules/exporting.js"></script>

3. Use HighchartControl.
   

   <hc:Chart runat="server"></hc:Chart>

Sample code below:

        
<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication11._Default" %>
<%@ Register TagPrefix="hc" TagName="Chart" Src="~/Controls/HighchartsControl.ascx" %>

<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
        <script src="https://code.highcharts.com/highcharts.js"></script>
        <script src="https://code.highcharts.com/modules/exporting.js"></script>

        <hc:Chart runat="server"></hc:Chart>
</asp:Content>