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The image will even appear in the Visual Studio design environment However, if you create a content page in another subfolder, the path is interpreted relative to that folder If the file doesn t exist there, you ll get a broken link instead of your graphic Even worse, you could conceivably get the wrong graphic if another image has the same filename This problem occurs because the <img> tag is ordinary HTML As a result, ASPNET won t touch it Unfortunately, when ASPNET builds your content page, this tag is no longer appropriate To solve your problem, you could try to think ahead and write your URL relative to the content page where you want to use it But this creates confusion, limits where your master page can be used, and has the unwelcome side effect of displaying your master page incorrectly in the design environment.

Here s an example of the latter: protected void Page_Load(Object sender, EventArgs e) { int count = (int)Application["HitCounterForOrderPage"]; count++; Application["HitCounterForOrderPage"] = count; lblCounterText = countToString(); } Once again, application state items are stored as objects, so you need to cast them when you retrieve them from the collection Items in application state never time out They last until the application or server is restarted or until the application domain refreshes itself (because of automatic process-recycling settings or an update to one of the pages or components in the application) Application state isn t often used, because it s generally inefficient In the previous example, the counter would probably not keep an accurate count, particularly in times of heavy traffic For example, if two clients requested the page at the same time, you could have a sequence of events like this: 1 User A retrieves the current count (432).

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The MultiView.ActiveViewIndex determines what view will be shown. This is the only view that s rendered in the page. The default ActiveIndex value is 1, which means no view is shown. You need to set the ActiveIndex programmatically. One option is to use a list control that lets users choose from the full list of views. Here s some sample code that binds the list of views to a list box: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) If (Not Page.IsPostBack) Then DropDownList1.DataSource = MultiView1.Views DropDownList1.DataTextField = "ID" DropDownList1.DataBind() End If End Sub And here s the code that sets the current view based on the list index: Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) MultiView1.ActiveViewIndex = DropDownList1.SelectedIndex End Sub Figure 16-2 shows the result.

Another quick fix is to make your image tag into a server-side control, in which case ASP NET will fix the mistake: <img src="bannerjpg" runat="server"/> This works because ASPNET uses this information to create an HtmlImage server control This object is created after the Page object for the master page is instantiated At this point, ASPNET interprets all the paths relative to the location of the master page You could use the same technique to fix <a> tags that provide relative links to other pages You can also use the root path syntax and start your URL with the ~ character For example, this <img> tag points unambiguously to the bannerjpg file in the MasterPages subfolder of the website: <img src="~/MasterPages/bannerjpg" runat="server" />.

2 User B retrieves the current count (432) 3 User A sets the current count to 433 4 User B sets the current count to 433 In other words, one request isn t counted because two clients access the counter at the same time To prevent this problem, you need to use the Lock() and Unlock() methods, which explicitly allow only one client to access the Application state collection at a time, as follows:.

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