ComboBox AppendDataBoundItems in asp.net ajax

ComboBox AppendDataBoundItems
ComboBoxAppendDataBoundItems.aspx

<%@ Page Language="C#" AutoEventWireup="true" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>

<!DOCTYPE html>

<script runat="server">
    void ComboBoxDataBind()
    {
        string[] Colors = { "Red", "Green", "Blue" };
        ComboBox1.DataSource = Colors;
        ComboBox1.DataBind();
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        ComboBox1.AppendDataBoundItems = true;
        ComboBoxDataBind();
        Label1.Text = "AppendDataBoundItems Now: True";
    }

    protected void Button2_Click(object sender, EventArgs e)
    {
        ComboBox1.AppendDataBoundItems = false;
        ComboBoxDataBind();
        Label1.Text = "AppendDataBoundItems Now: False";
    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Ajax ComboBox - How to use AppendDataBoundItems in asp.net ComboBox</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:DarkBlue; font-style:italic;">
            ASP.NET Ajax ComboBox - How to use 
            <br />AppendDataBoundItems in asp.net ComboBox
        </h2>
        <hr width="475" align="left" color="LightBlue" />
        <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
        </asp:ToolkitScriptManager>
        <asp:Label 
            ID="Label1"
            runat="server"
            Font-Size="Large"
            ForeColor="Green"
            >
        </asp:Label>
        <br /><br />
        <asp:ComboBox 
            ID="ComboBox1" 
            runat="server" 
            DropDownStyle="DropDown" 
            AutoCompleteMode="None"
            CaseSensitive="false"
            RenderMode="Block"
            AutoPostBack="false"
            Font-Names="Comic Sans MS"
            Font-Size="Medium"
            >
            <asp:ListItem Text="White"></asp:ListItem>
        </asp:ComboBox>
        <br /><br /><br />
        <br /><br />
        <asp:Button 
            ID="Button1"
            runat="server"
            OnClick="Button1_Click"
            Text="Populate ComboBox: AppendDataBoundItems True"
            Height="45"
            Font-Bold="true"
            ForeColor="DodgerBlue"
            />
        <br />
        <asp:Button 
            ID="Button2"
            runat="server"
            OnClick="Button2_Click"
            Text="Populate ComboBox: AppendDataBoundItems False"
            Height="45"
            Font-Bold="true"
            ForeColor="DodgerBlue"
            />
    </div>
    </form>
</body>
</html>