Do you have write a method to excute these code?You can also write a method  on "onchange" event.

well,a is already the value of the first numberbox,and b is the value of the second numberbox.You needn't to get value again when you sum.

Code:

var sum = a - b;

Thanks for your help.I will have a try!!

Thanks a lot for you help.I've used the method you mentioned,it works well when it loads only a little data,but the page will be no response when it loads a little more data.Are there any other methods?

I've updated the datagrid data use the "updaterow" method,but it will have no response with a little more data,and when I use the "loadData" method,it can not record the scroll position and scroll to the top,could you please help me?I want to update the data and hold the scroll position. 3q!