You can check our line chart demos here
In the upright corner you have an Example tab and a Code tab where you can check out the code to the examples.
If you have installed the Telerik Silverlight Controls you should have all the examples under you local installation path i.e. C:\Program Files (x86)\Telerik
There you should see a folder named "RadControls for Silverlight Q2 2011 SP1" for example depending on the controls' version that you have installed.
There you should see a "Demos" folder which contains a VS solution "ExamplesCS_SL.sln".
RadChart provides full support of DateTime values and allows you to show dates on the X-Axis. You can find more information about this here
Most of our demos use the MVVM pattern to set the ItemsSource. There are plenty of resources online that should make you familiar with the MVVM. For example this information about MVVM on MSDN
If you have more questions about our controls we'll be happy to assist you.
the Telerik team
Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>