Convert.FromBase64String and view state encoding : ViewState « Page Lifecycle « ASP.NET Tutorial

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
        <asp:Button ID="Button1" OnClick="Button1_Click" runat="server" Text="Button" /></div>
    </form>
</body>
</html>

File: Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class SimpleViewState : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    Label1.Text = "Hello World!";
    }
  protected void Button1_Click(object sender, EventArgs e)
  {
    string viewStateString = "/wEPDwUKLTE2MjY5MTY1NQ9kFgICAw9kFgICAQ8PFgIeBFRleHQFDEhlbGxvIFdvcmxkIWRkZPsbiNOyNAufEt7OvNIbVYcGWHqf";
    
    byte[] stringBytes = Convert.FromBase64String(viewStateString);

    
    string decodedViewState = System.Text.Encoding.ASCII.GetString(stringBytes);
    Label1.Text = decodedViewState;
  }
}

5.21.ViewState
	5.21.1.	Use ViewState to create a simple counter (C#)
	5.21.2.	Save string variable to ViewState
	5.21.3.	Convert.FromBase64String and view state encoding
	5.21.4.	Use ViewState to store random data
	5.21.5.	Visualize the current Base64-encoded contents of the view state
	5.21.6.	Track Your Viewstate