Assign click event to ASP.Net Pie Chart in ASP.Net

i am referenceing this article

https://www.aspsnippets.com/Articles/Populate-ASPNet-40-Chart-Control-Pie-Chart-from-SQL-Server-Database.aspx

how i get the click item value send to the page 

i am viewing this article but not any success 

https://stackoverflow.com/questions/7385676/how-to-create-a-mouse-click-event-for-an-item-point-from-a-pie-chart