Get The String Data From The Textbox Placed Inside A Cell Of A Table?

I am working on a project with asp.net and vb.net language system.Now I made a table on the asp file, and before clicking on a button "update", by JavaScript, I would like to get all the string data written in the text boxes each placed inside a cell of the table.Now, I wrote the following codes;

function getData(){
var tblData = new Array();
var table = document.getElementById("<%=tblA.ClientID%>");

[code]....