MultiHandleSliderExtender not working master child page

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C#

ASP.NET

hello every i am working with MultiHandleSliderExtender for bind price range .

when i coded for simple page (without atteched master page ) working fine but when i using in master child page then it is not working .

please suggest me anyone

my code is

<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default4.aspx.cs" Inherits="Default4" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

        <title></title>

     <style type="text/css">
        body
        {
            font-family: Arial;
            font-size: 10pt;
            margin: 0;
            padding: 0;
        }
        .loader
        {
            height: 50px;
            width: 100px;
        }
        .item
        {
            width: 202px;
            border: 1px solid #ccc;
            box-shadow: 2px 2px 8px 2px #ccc;
        }
        .item .header
        {
            height: 30px;
            background-color: #9F9F9F;
            color: #fff;
        }
        .item .body
        {
            width: 200px;
            height: 200px;
        }
        .item .image
        {
            height: 200px;
            width: 200px;
        }
        .item .footer
        {
            height: 50px;
        }
        .button, .button:hover
        {
            height: 45px;
            padding: 10px;
            color: White;
            line-height: 23px;
            text-align: center;
            font-weight: bold;
            cursor: pointer;
            border-radius: 4px;
            text-decoration: none;
            background-color: #9F9F9F;
            border: 1px solid #5C5C5C;
        }
        #price_slider, #price_slider_value
        {
            width: 400px;
            margin: 5px;
        }
        #empty
        {
            display: block;
            width: 400px;
            background-color: #9F9F9F;
            color: #fff;
            height: 30px;
            line-height: 30px;
            margin: 5px;
            text-align: center;
        }
        .modal
        {
            position: fixed;
            z-index: 999;
            height: 100%;
            width: 100%;
            top: 0;
            background-color: Black;
            filter: alpha(opacity=60);
            opacity: 0.6;
            -moz-opacity: 0.8;
        }
        .center
        {
            z-index: 1000;
            margin: 300px auto;
            padding: 10px;
            width: 130px;
            background-color: White;
            border-radius: 10px;
            filter: alpha(opacity=100);
            opacity: 1;
            -moz-opacity: 1;
        }
        .center img
        {
            height: 128px;
            width: 128px;
        }
    </style>

       <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"   EnablePartialRendering="true">
    </asp:ToolkitScriptManager>
    <asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1">
        <ProgressTemplate>
            <div class="modal">
                <div class="center">
                    <img alt="" src="loader.gif" />
                </div>
            </div>
        </ProgressTemplate>
    </asp:UpdateProgress>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
           <asp:MultiHandleSliderExtender ID="MultiHandleSliderExtender1" runat="server" TargetControlID="txtSlider"
                Minimum="1" Maximum="1000" Increment="1" RaiseChangeOnlyOnMouseUp="true" EnableRailClick="false"
                OnClientDragEnd="OnClientDragEnd">
                <MultiHandleSliderTargets>
                    <asp:MultiHandleSliderTarget ControlID="hfStart" />
                    <asp:MultiHandleSliderTarget ControlID="hfEnd" />
                </MultiHandleSliderTargets>
            </asp:MultiHandleSliderExtender>
            <asp:HiddenField ID="hfStart" runat="server" />
            <asp:HiddenField ID="hfEnd" runat="server" />
            <asp:TextBox ID="txtSlider" runat="server"></asp:TextBox>
            <asp:LinkButton ID="lnkSliderChanged" OnClick="SliderChanged" runat="server" />
            <script type="text/javascript">
                function OnClientDragEnd(sender, args) {
                    document.getElementById("<%=lnkSliderChanged.ClientID %>").click();
                }
            </script>
            <br />
            <hr />
            <asp:DataList ID="dlProducts" runat="server" RepeatLayout="Table" RepeatColumns="3"
                CellPadding="2" CellSpacing="20">
                <ItemTemplate>
                    <table class="item" cellpadding="0" cellspacing="0" border="0">
                        <tr>
                            <td align="center" class="header">
                                <span class="name">
                                    <%# Eval("Name") %></span>
                            </td>
                        </tr>
                        <tr>
                            <td align="center" class="body">
                                <asp:Image ImageUrl='<%# Eval("ProductId", "~/images/{0}.png")%>' runat="server"
                                    CssClass="image" />
                            </td>
                        </tr>
                        <tr>
                            <td class="footer" align="center">
                                <span class="button">
                                    <%# Eval("Price") %></span>
                            </td>
                        </tr>
                    </table>
                </ItemTemplate>
            </asp:DataList>
        </ContentTemplate>
    </asp:UpdatePanel>
</asp:Content>

and c# code is

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
public partial class Default4 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            this.BindDataList();
        }

    }
    protected void SliderChanged(object sender, EventArgs e)
    {
        System.Threading.Thread.Sleep(2000);
        this.BindDataList();
    }

    private void BindDataList()
    {
        string constr = ConfigurationManager.ConnectionStrings["ErpConnection1"].ConnectionString;
        int start = !string.IsNullOrEmpty(Request.Form[hfStart.UniqueID]) ? int.Parse(Request.Form[hfStart.UniqueID]) : 0;
        int end = !string.IsNullOrEmpty(Request.Form[hfEnd.UniqueID]) ? int.Parse(Request.Form[hfEnd.UniqueID]) : 0;
        using (SqlConnection con = new SqlConnection(constr))
        {
            string query = "SELECT * FROM Products WHERE (Price BETWEEN @Start AND @End) OR (@Start = 0 AND @End = 0);";
            query += "SELECT MIN(Price) [Min], MAX(Price) [Max] FROM Products";
            using (SqlCommand cmd = new SqlCommand(query))
            {
                cmd.Connection = con;
                cmd.Parameters.AddWithValue("@Start", start);
                cmd.Parameters.AddWithValue("@End", end);
                using (SqlDataAdapter sda = new SqlDataAdapter(cmd))
                {
                    DataSet ds = new DataSet();
                    sda.Fill(ds);
                    dlProducts.DataSource = ds.Tables[0];
                    dlProducts.DataBind();
                    if (!this.IsPostBack)
                    {
                        hfStart.Value = ds.Tables[1].Rows[0]["Min"].ToString();
                        hfEnd.Value = ds.Tables[1].Rows[0]["Max"].ToString();
                    }
                }
            }
        }
    }
}