navigation - ASP.NET Back Button for multiple forms -

i trying track navigation between number of web forms in asp.net. i've tried client side navigation using following:

<asp:button id="backbutton" runat="server" text="back"              onclientclick="javascript:window.history.back(1);return false;" /> 

unfortunately not work scenario due postbacks going on. scenario has number of web forms:

• page1.1
• page1.2
• page2
• page3

navigating forward through pages works wizard. there 2 starting points - page1.1 , page1.2.

page1.1 -> page2 -> page3
page1.2 -> page2 -> page3

so clicking buttons have following navigation:

page3 -> page2
page2 -> page1.1
page2 -> page1.2

there additional parameters passed between pages need maintained.

i looking @ maintaining in session maintain current call stack works however, getting build of referrer urls. @ minute trying conceptualise this.

i running in sharepoint application pages, each page asp.net page sake of example.

so have introduced abstract class each page:

public abstract class securelayoutspagebase : system.web.ui.page {     private pagecontroller _pagecontroller;      protected override void onload(eventargs e)     {         base.onload(e);          _pagecontroller = (pagecontroller)session["pagecontroller"];         if (_pagecontroller == null)         {             _pagecontroller = new pagecontroller();             session["pagecontroller"] = _pagecontroller;         }          if (!page.ispostback && page.request.urlreferrer != null)         {             this.pagecontroller.history.push(page.request.urlreferrer.tostring());         }     }      protected pagecontroller pagecontroller     {                 {             return _pagecontroller;         }     }  } 

which has instance of pagecontroller:

[serializable()] public class pagecontroller {     private stack<string> _history = new stack<string>();      public void previous(httpresponse response)     {         string previous = _history.pop();         response.redirect(previous);     }      public stack<string> history     {                 {             return _history;         }     } } 

then each page call pagecontroller.previous in server side event handler button click:

protected void backbutton_click(object sender, eventargs e) {     this.pagecontroller.previous(this.response); } 

this issue calling pagecontroller.previous still results in url being added stack. wondering if there way prevent url getting added when has been clicked. or alternative solutions...

history(-1) wont work, because include postbacks. set button href dependant on whatever page you're on. if know itsloaded page 3, set button page 2