Data Controls :: Slow Loading Page In Primary Key For Next Loaded Data - Primary Key Not Show Properly

I am working on lazy loading page the problem is

when i bind first time page (10) records then primary properly bind with records and when my next 10 records load using lazy loading then the primary key not change it shows 1st records primary key

check the below code in which i am assigning assetid (primary key) but its not assigning properly...

function OnSuccess(response) {
//alert('testing');
var xmlDoc = $.parseXML(response.d);
var xml = $(xmlDoc);
pageCount = parseInt(xml.find("PageCount").eq(0).find("PageCount").text());
var customers = xml.find("AssetSummary");

[Code].....