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The MultiView is the simpler of the two multiple view controls. Essentially, the MultiView gives you a way to declare multiple views and show only one at a time. It has no default user interface you get only whatever HTML and controls you add. The MultiView is equivalent to the custom panel approach explained earlier. Creating a MultiView is suitably straightforward. You add the <asp:MultiView> tag to your .aspx page file and then add one <asp:View> tag inside it for each separate view: <asp:MultiView ID="MultiView1" runat="server"> <asp:View ID="View1" runat="server">...</asp:View> <asp:View ID="View2" runat="server">...</asp:View> <asp:View ID="View3" runat="server">...</asp:View> </asp:MultiView> Inside the <asp:View> tag, you add the HTML and web controls for that view: <asp:MultiView ID="MultiView1" runat="server" ActiveViewIndex="0"> <asp:View ID="View1" runat="server"> <b>Showing View #1<br /> <br /> <asp:Image ID="Image1" runat="server" ImageUrl="~/cookies.jpg" /></b> </asp:View> <asp:View ID="View2" runat="server"> <b>Showing View #2</b><br /> <br /> Text content. </asp:View> <asp:View ID="View3" runat="server"> <b>Showing View #3</b><br /> <br /> <asp:Calendar ID="Calendar1" runat="server"></asp:Calendar> </asp:View> </asp:MultiView>

The information in session state is very secure, because it is stored exclusively on the server. However, the cookie with the session ID can easily become compromised. This means an eavesdropper could steal the cookie and assume the session on another computer. Several workarounds address this problem. One common approach is to use a custom session module that checks for changes in the client s IP address (see http://msdn.microsoft.com/msdnmag/ _issues/04/08/WickedCode for a sample implementation). However, the only truly secure approach is to restrict session cookies to portions of your website that use SSL. That way, the session cookie is encrypted and useless on other computers. If you choose to use this approach, it also makes sense to mark the session cookie as a secure cookie so that it will be sent only over SSL connections. That prevents the user from changing the URL from https:// to http://, which would send the cookie without SSL. Here s the code you need: Request.Cookies["ASP.NET_SessionId"].Secure = true; Typically, you ll use this code immediately after the user is authenticated. Make sure there is at least one piece of information in session state so the session isn t abandoned (and then re-created later).

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Another related security risk exists with cookieless sessions. Even if the session ID is encrypted, a clever user could use a social engineering attack to trick a user into joining a specific session. All the malicious user needs to do is feed the user a URL with a valid session ID. When the user clicks the link, they join that session. Although the session ID is protected from this point onward, the attacker now knows what session ID is in use and can hijack the session at a later time. Taking certain steps can reduce the likelihood of this attack. First, when using cookieless sessions, always set regenerateExpiredSessionId to true. This prevents the attacker from supplying a session ID that s expired. Next, explicitly abandon the current session before logging in a new user.

You can also add views programmatically (like any other control) by instantiating a new view object and adding it to the MultiView with the Add() or AddAt() methods of the Views collection.

One quirk that can catch unsuspecting developers is the way that master pages handle relative paths If all you re using is static text, this issue won t affect you However, if you ve added <img> tags or any other HTML tag that points to another resource, problems can occur The problem shows up if you place the master page in a different directory from the content page that uses it This is a recommended best practice for large websites In fact, Microsoft encourages you to use a dedicated folder for storing all your master pages However, if you re not suitably careful, this can cause problems when you use relative paths For example, imagine you put a master page in a subfolder named MasterPages and add the following <img> tag to the master page: <img src="bannerjpg" /> Assuming the file \MasterPages\bannerjpg exists, this appears to work fine.

Application state allows you to store global objects that can be accessed by any client Application state is based on the SystemWebHttpApplicationState class, which is provided in all web pages through the built-in Application object Application state is similar to session state It supports the same type of objects, retains information on the server, and uses the same dictionary-based syntax A common example with application state is a global counter that tracks how many times an operation has been performed by all of the web application s clients For example, you could create a globalasax event handler that tracks how many sessions have been created or how many requests have been received into the application Or you can use similar logic in the PageLoad event handler to track how many times a given page has been requested by various clients.

Visual Studio shows all your views at design time, one after the other (see Figure 16-1). You can edit these regions in the same way you design any other part of the page.

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