如何突出显示网格视图的最后插入记录？

I wants to highlight the last inserted record on grid view . In my grid view i have a primary key column. newly inserted rows are placing according to the ascending order of this primary key. Now i wants to highlight the last inserted row. from a search i have written like this, but it shows the last row of grid view highlighted., not the newly inserted row. please help. my code is here ,I wants to highlight the last inserted record o