I am looking for any paging sample for flexgrid mvc control, traced from all the sample site you have i know whats the postback data is.
BUT how is the practical way to use the postback data as the sample is showing parameter received is a formcollectiondata even more the sample keep returning sales.getdata(500)

SERIOUSLY, your component is not free, quite expensive to be honest. And you know whats asp.net mvc excel at, its the automatic model mapping on post back