I am afraid RadChart for ASP.NET does not support multiple stack groups e.g. two stacks with 3 series each for the same date. This is available in RadChart for SIlverlight as shown here
. It also supports the necessary grouping functionality as shown in this example
. Finally, here is how to integrate RadChart for Silverlight into ASP.NET page:
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!