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How to add List Item to a ListBox in asp.net c#

asp.net ListBox: how to add List Item programmatically
ListBoxAddItem.aspx 
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ListBoxAddItem.aspx.cs" Inherits="ListBoxAddItem" %>

<!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 ListBox: how to add List Item programmatically</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Navy">ListBox Add Item</h2>
        <asp:ListBox ID="ListBox1" runat="server">
            <asp:ListItem Text="CheckBox" Value="1"></asp:ListItem>
            <asp:ListItem Text="CheckBoxList" Value="2"></asp:ListItem>
        </asp:ListBox>
        <br /><br />
        <asp:Label ID="Label1" runat="server">
        </asp:Label>
        <asp:TextBox ID="TextBox1" runat="server">
        </asp:TextBox>
        <br />
        <asp:Label ID="Label2" runat="server">
        </asp:Label>
        <asp:TextBox ID="TextBox2" runat="server">
        </asp:TextBox>
        <br />
        <asp:Button ID="Button1" runat="server" Text="Add Item" OnClick="Button1_Click" />
    </div>
    </form>
</body>
</html>
ListBoxAddItem.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 ListBoxAddItem : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if(!this.IsPostBack)
        {
            Label1.Text = "New Item Text";
            Label1.ForeColor = System.Drawing.Color.Green;
            Label2.Text = "New Item Value";
            Label2.ForeColor = System.Drawing.Color.Green;
            ListBox1.BackColor = System.Drawing.Color.HotPink;
            ListBox1.ForeColor = System.Drawing.Color.White;
            ListBox1.BorderColor = System.Drawing.Color.Crimson;
            ListBox1.BorderWidth = 2;
            TextBox1.BackColor = System.Drawing.Color.HotPink;
            TextBox1.ForeColor = System.Drawing.Color.Snow;
            TextBox2.BackColor = System.Drawing.Color.HotPink;
            TextBox2.ForeColor = System.Drawing.Color.Snow;
            Button1.ForeColor = System.Drawing.Color.HotPink;
            Button1.Font.Bold = true;
        }
    }

    protected void Button1_Click(object sender, EventArgs e) {
        ListItem li = new ListItem();
        li.Text = TextBox1.Text.ToString();
        li.Value = TextBox2.Text.ToString();
        ListBox1.Items.Add(li);
    }
}








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