datapager error in siliverligh 4

Question

I have used datagrid in silverlight 4 and datapager. It is working fine. I have 15 records in my table. Both control datagrid and datapager are bound to DomianDataSource control of riacontrol. I have mentioned LoadSize=20 and PageSize=5 . This setting is perfectly working. But when I change LoadSize=10 and PageSize=5 . In this case, first page gets loaded and also second page gets loaded when click on navigation button in datapager. But at the moment I click for next page 3 to load it give me exception .

Do i need to handle this case in code?