Subscriptions & Downloads Subscribe to everything . Subscribe to WMV . Subscribe to M4V for iPod . Subscribe to MP3 . Download WMV . Download M4V for iPod . Download MP3 . Show Notes: The current UpdatePanel functionality with regards to back. The UpdatePanel with History in .NET 3.5 SP1 Beta1. EnableSecureHistoryState. INETA Community Champions Program @ http://www.ineta.org/Champions/CommunityChampionInfo.aspx. Images: This is the UpdatePanel with EnableSecureHistoryState set to true This is the UpdatePanel with EnableSecureHistoryState set to false . Source Code: <% @ Language ="C#" AutoEventWireup ="true" CodeFile ="UpdatePanelHistory.aspx.cs" Inherits ="UpdatePanelHistory" %> <! 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"> < > UpdatePanel History Button</ > </ head > < body > < id ="form1" runat ="server"> < : ID ="scm" runat ="server" EnableHistory ="true" OnNavigate ="scm_Navigate" /> < > < : ID ="btnSubmit" runat ="server" Text ="Click Me!" onclick ="btnSubmit_Click" /> < : ID ="upl" runat ="server" UpdateMode ="Conditional"> < > < : ID ="lblTime" runat ="server" /> </ > < > < : ControlID ="btnSubmit" EventName ="Click" /> </ > </ : > </ > </ > </ body > </ html > using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using Syst ...