How to call Usercontrol in Asp.Net or Js file

Ascx Page(User control page)—–

<%@ Control Language=”C#” AutoEventWireup=”true” CodeBehind=”WebUserControl1.ascx.cs” Inherits=”WebApplication2.UControls.WebUserControl1″ %>
<asp:TextBox ID=”txt1″ runat=”server”></asp:TextBox>

Asp.net Page—

<%@ Page Language=”C#” MasterPageFile=”~/Site.master” CodeBehind=”Default.aspx.cs” Inherits=”WebApplication2._Default” %>
<%@ Register  Src=”~/UControls/UserControlMultipleInstance.ascx”  TagName=”UserControlMultipleInstance” TagPrefix=”uc1″%>
<%@ Register Src=”~/UControls/WebUserControl1.ascx” TagName=”uio” TagPrefix=”kl” %>

<asp:Content ID=”headContent” ContentPlaceHolderID=”head” Runat=”Server”>

</asp:Content>

<asp:Content ID=”Content1″ ContentPlaceHolderID=”ContentPlaceHolder1″ Runat=”Server”>

<script type=”text/javascript” src=”~/Scripts/JavaScript1.js”></script>
<asp:ScriptManagerProxy ID=”ScriptManagerProxy1″ runat=”server” />

<h2>My tables</h2>
<div id=”div1″>
<kl:uio ID=”UserControlMultipleInstance1″  runat=”server” />
</div>
<br />
<div id=”div2″>
<kl:uio ID=”UserControlMultipleInstance2″  runat=”server” />
</div>
<br />
<div id=”div3″>
<kl:uio ID=”UserControlMultipleInstance3″  runat=”server” />
</div>

<br /><br />
<asp:Button ID=”Button1″ runat=”server” onclick=”Button1_Click” ClientIDMode=”Static”
Text=”Call UserControl Instance1″ />
&nbsp;&nbsp;
<asp:Button ID=”Button2″ runat=”server” onclick=”Button1_Click” onClientClick=”abc();”
Text=”Call UserControl Instance2″ />
&nbsp;&nbsp;
<asp:Button ID=”Button3″ runat=”server” onclick=”Button1_Click” onClientClick=”abc();”
Text=”Call UserControl Instance2″ />

</asp:Content>

—-In Js file

var ContainerId;

function SetContainerID(ParentContainerID) {
ContainerId = ParentContainerID;
}

function abc(ParentContainerID) {
//var ParentContainerID=’div1′;
SetContainerID(ParentContainerID);
alert(“TextBox Contentx: ” + $(‘#’+ContainerId+’ [id$=txt1]’).val());
}

—If codebehind use–

protected void Button1_Click(object sender, EventArgs e)
{
//Control ctrl = “”;
TextBox ctrl1 = UserControlMultipleInstance1.FindControl(“txt1”) as TextBox;

string de=ctrl1.Text;
}