Working with a List of multiple Lists as data source to multiple Line Series in the Line Chart

[Ravi]

Hi,

 

My stored procedure gives a list of absentees per week in a date range.  I am getting one list per each college. How can I combine multiple lists in to one Master List, and use that Master List to loop through the Lists + their elements, and Add the CategorySeriesItem and it's corresponding WeekNumber (from a date range)  in XAxis.

Please help me out in the right direction or with sample code.