Do you mean ASP.NET Panel control or UpdatePanel?
If ASP.NET Panel, it is rendered as DIV at run time. Apart from that there won't be any issues when displaying a CheckBoxList inside a Panel or without Panel.
Check this code.
.aspx code
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DemoPage38.aspx.cs" Inherits="DemoPage38" %>
<!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></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table width="100%">
<tr>
<td>
<asp:Panel ID="Panel1" runat="server">
<asp:CheckBoxList ID="cblBooks" runat="server">
</asp:CheckBoxList>
</asp:Panel>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
C# Code
using System;
using System.Data;
public partial class DemoPage38 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindCheckBoxList();
}
}
private void BindCheckBoxList()
{
//You can load the following DataTable from a database
DataTable dtBooks = new DataTable();
dtBooks.Columns.Add("Book_Id", System.Type.GetType("System.Int32"));
dtBooks.Columns.Add("Book_Name", System.Type.GetType("System.String"));
dtBooks.Rows.Add(new object[] { 100, "ASP.NET Programming" });
dtBooks.Rows.Add(new object[] { 101, "Beginning Web Development" });
dtBooks.Rows.Add(new object[] { 102, "ASP.NET for Dummies" });
dtBooks.Rows.Add(new object[] { 103, "SharePoint 2007" });
dtBooks.Rows.Add(new object[] { 104, "PHP Programming" });
//Binding DataTable to the CheckBoxList control
cblBooks.DataSource = dtBooks;
cblBooks.DataTextField = "Book_Name";
cblBooks.DataValueField = "Book_Id";
cblBooks.DataBind();
}
}
Unsolved 
