How to fetch gridView row values on click of Update button

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ASP.NET

jQuery

C#3.5

Hi,
I have a scenario where i need to check the row values before hitting the dB to store those values,the issue arises when I try to fetch the value of the row specific column. Now suppose, if i have a text box in the grid and then I click on Edit that makes a particular row open for edit on click of submit/ok button I need to retrieve the latest value of the Textbox but the javascript fetches the previous value.

The following is the Javascript/jquery used

function GetSelectedRow(lnk) {
       var row = lnk.parentNode.parentNode;
       var rowIndex = row.rowIndex - 1;
       var customerId = row.cells[0].innerHTML;
       var city = row.cells[1].getElementsByTagName("input")[0].value;
       alert("RowIndex: " + rowIndex + " CustomerId: " + customerId + " City:" + city);
       return false;
   }

Any help................