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Remove CheckBoxList list item in asp.net c#

asp.net CheckBoxList: how to remove list item programmatically
CheckBoxListRemoveItem.aspx 
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="CheckBoxListRemoveItem.aspx.cs" Inherits="CheckBoxListRemoveItem" %>

<!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>asp.net CheckBoxList: how to remove list item programmatically</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Red">CheckBoxList: Remove List Item</h2>
        <asp:Label 
            ID="Label1" 
            runat="server"
            >
        </asp:Label>
        <br /><br />
        <asp:CheckBoxList 
            ID="CheckBoxList1"
            runat="server"
            RepeatColumns="3"
            BorderColor="Blue"
            BorderWidth="2"
            BackColor="DodgerBlue"
            ForeColor="Snow"
            >
            <asp:ListItem>Red</asp:ListItem>
            <asp:ListItem>Orange</asp:ListItem>
            <asp:ListItem>Yellow</asp:ListItem>
            <asp:ListItem>Blue</asp:ListItem>
            <asp:ListItem>White</asp:ListItem>
        </asp:CheckBoxList>
        <br />
        <asp:Button 
            ID="Button1"
            runat="server"
            Font-Bold="true"
            ForeColor="DarkBlue"
            Text="Remove Selected Item(s)"
            OnClick="Button1_Click"
            />
    </div>
    </form>
</body>
</html>
CheckBoxListRemoveItem.aspx.cs 
using System;
using System.Collections;
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 CheckBoxListRemoveItem : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if(!Page.IsPostBack)
        {
            Label1.ForeColor = System.Drawing.Color.OrangeRed;
            Label1.Font.Bold = true;
        }
    }

    protected void Button1_Click(object sender, EventArgs e) {
        Label1.Text = "Items removed:";
        ArrayList ListItems = new ArrayList();
        foreach (ListItem li in CheckBoxList1.Items)
        {
            if (li.Selected == true)
            {
                ListItems.Add(li.Text.ToString());
            }
        }
        for (int i = 0; i < ListItems.Count; i++)
        {
            string currentItem =(string) ListItems[i];
            ListItem li = new ListItem();
            li.Text = currentItem;
            CheckBoxList1.Items.Remove(li);
            Label1.Text += " " + currentItem; 
        }
    }
}








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