Is this code supposed to appear in the HTML page info?

I'm reading "Beginning ASP .NET 4 in C# and VB" and the book asks me to look at the HTML source after loading the page that I created with the following code:

ControlsDemo.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ControlsDemo.aspx.cs" Inherits="Demos_ControlsDemo" %>


<!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>

    

      <asp:TextBox ID="YourName" runat="server"></asp:TextBox>

      Your name<asp:Button ID="SubmitButton" runat="server" 

        onclick="SubmitButton_Click" Text="Submit Information" />

      <br />

      <asp:Label ID="Label1" runat="server"></asp:Label>

    

    </div>

    </form>

</body>

</html>

ControlsDemo.aspx.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;


public partial class Demos_ControlsDemo : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {


    }

    protected void SubmitButton_Click(object sender, EventArgs e)

    {

      Label1.Text = "Your name is " + YourName.Text;

    }

}

And it generates the following HTML:


<!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><title>

</title></head>


<body>


    <form method="post" action="ControlsDemo.aspx" id="form1">


<div class="aspNetHidden">


<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUKMjA3NjE4MDczNmRkRGmHS7RUhqAsayIODjq5pVJOcGbUHV0WvUwTwAHUntw=" />


</div>


<div class="aspNetHidden">


	<input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWAwL1/Mu5BALTydp0ArK44tQL6C3smRvQPjZBKPU4WeN35xjWrwcelGNXJR2senwT5+I=" />


</div>


    <div>

 

      <input name="YourName" type="text" id="YourName" />


      Your name<input type="submit" name="SubmitButton" value="Submit Information" id="SubmitButton" />


      <br />


      <span id="Label1"></span>

   

    </div>


    </form>


</body>


</html>

In the book there is no mention of the div tags containing the class aspNetHidden. Is that code supposed to be displaying in the HTML code? I find it kind of strange.