I prepared a sample page where I use RadChart
with two Line series and populate them with some random items.
If you wan tto know how you can create a chart with more than one series (in general), you can use a "for" loop and create a single series on each iteration and then add it to the chart's Series collection. On the other hand, if you have problems implementing a specific scenario, with multiple Line series, could you explain it to me in short, so I can give you some suggestions? You can also modify my page to show me your case and send it back to me.
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