With .NET 3.5 you had to separately download the chart
controls and add them into your application. With .NET 4 these controls
are now built-into ASP.NET 4 and Windows Forms 4 – which means you can
immediately take advantage of them out of the box (no separate download or
registration required).
Within ASP.NET 4 applications you’ll find that there is now
a new built-in <asp:chart> control within the “Data” tab of the Toolbox:
You can use this control without having to register or
wire-up any configuration file entries. All of the charting control
configuration is now pre-registered with ASP.NET 4 (meaning nothing has to be
added to an application’s web.config file for them to work). This enables
you to maintain very clean and minimal Web.config files.