Hello Jose David Escobar Ardila,
Attached is a runnable sample application that demonstrates the approach from the help topic.
Note, that if you did not use VS Toolbox to drag&drop chart control to your project but you instantiated it manually, you will need to actually create the ChartSeries as well:
//ChartSeries series = new ChartSeries();
radChart1.DataSource = products;
As for your second question -- we are a bit unsure what exactly are you looking for. Please elaborate a bit more if the problem still persists so we can advise you properly how to proceed.
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