i found a serious problem that when i click on button then postback happen but i stopped the postback.
my code is follows. please see what is wrong in it.
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
<script type="text/javascript" language="javascript">
function ShowDiv()
{
var modalWindow = document.createElement('div');
modalWindow.style.position = 'absolute';
modalWindow.style.height = '1 ...
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