Get or append data to reportviewer

Question

In my project i need one important concept like getting last tr and td value of gridview using javascript..i have done with bind 10 data to reportviewer control initially..now i want to add or append another 20 0r 30 record with existing data in reportviewer..if any possible to add data to reportviewer using javascript please tell me..and also how to get last row value details in reportviewer as runtime using javascript...please help me.