Disabling Back button on the browser [closed]

Question

I am writing an application that if the user hits back, it may resend the same information and mess up the flow and integrity of data. How do I disable it for users who are with and without javascript on?

Answer 1

Best option is not to depend on postbacks to control flow, however if you are stuck with it (for now)

you may use something like this:

  Response.Cache.SetCacheability(HttpCacheability.NoCache);
  Response.Cache.SetExpires(Now.AddSeconds(-1));
  Response.Cache.SetNoStore();
  Response.AppendHeader("Pragma", "no-cache");

Soon you will find that it will not work on all browsers, but then you may introduce a check in your code like:

 if (Page.IsPostBack)
 {
        if (pageIsExpired()){
           Response.Redirect("/Some_error_page.htm");
        }
        else {
           var now = Now;
           Session("TimeStamp") = now.ToString();
           ViewState("TimeStamp") = now.ToString();
        }

  private boolean pageIsExpired()
  {
     if (Session("TimeStamp") == null || ViewState("TimeStamp") == null)
        return false;

     if (Session("TimeStamp") == ViewState("TimeStamp"))
        return true;

        return false;
  }

That will solve problem to some extend, Code not checked -- only for examples purposes..