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Textbox loses its value after postback

Posted By:      Posted Date: October 18, 2010    Points: 0   Category :ASP.Net
 

There is button(btnOpen) and a textbox (txtResult) in the page. 

Once I clicked on btnOpen, a modal dialog will appear, displaying TextBox1 and Button1.

The user is required to type something in TextBox1 and I want to pass the TextBox1.Text into my database but when I try to do that, the value actually = "", which is gone. 

So I created this test program to illustrate by passing the value into a txtResult. 

Can anyone guide me on getting the TextBox1.Text value?


Besides that, is there anyone to tell more about what does this lines of code do?

$("#Button1").click(function () {
                <%=this.Page.ClientScript.GetPostBackEventReference(new PostBackOptions(this.Button1))%>;
            });

The aspx code:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication10.WebForm1" %>

<!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">

    <link href="Styles/jquery-ui-1.8.5.custom.css" rel="stylesheet" type=&


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