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Convert FromBase64String and view state encoding

<%@ 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;   } }