Password textbox is being blank on seleted index changed of dropdown


HI friend,
check this code

[code]
using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        myBody.Attributes.Add("onload", "document.getElementById('txtPassword').value = '" + txtPassword.Text.ToString() + "'");

           


    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
       
    }
}


<%@ 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>
</head>
<body id="myBody" runat="server" >
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="txtPassword" TextMode="Password"  runat="server"></asp:TextBox>
        <asp:DropDownList ID="DropDownList1" AutoPostBack="true"  runat="server"
            onselectedindexchanged="DropDownList1_SelectedIndexChanged">
            <asp:ListItem>Abc</asp:ListItem>
            <asp:ListItem>XYZ</asp:ListItem>
            <asp:ListItem>Nothing</asp:ListItem>
        </asp:DropDownList>
    </div>
    </form>
</body>
</html>

[/code]

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