Can't get created table ID

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C#3.0

C#

ASP.NET

Hi friends,

I need ur help...

I have a div and made it has runat="server" & creating tables dynamically by
calling function in javascript and i can get all the ID created inside the table
like lable, textbox etc... and going all calculation.

My Problem is,
When I click save button, I cant able to get any ID'd (lable, textbox etc...)


DESIGN CODE....

<div id="div1" runat="server">


C# CODE...

TextBox txt = FindControl("txt_ItemCode_" + i) as TextBox;
OR
ItemCode = Request.Form["txt_ItemCode_" + i];


Here in both codes I'm getting null (can't get ID)


Thanks,
Praveen