Dear friends:
        I want to get a function  that a Line show two colors!  But,I don't Know how to do it.
       For  example, a Line chart,X-Date, Y-Value.
       When Date <= Today then the line's color is Red or the PointMark is Red ,
                 Date > Today then the line's color is Green or the PointMark is Green.
 

      need your help,thank you !

     

Hello Alex,

You may review our MVVM support help topic as well as this online demo that I believe are exactly what you require.

Kind regards,
Evgenia
the Telerik team