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That s because the entire control model including the controls from every view is created on every postback and persisted to view state For the most part, this won t be a significant factor, unless you are manipulating a large number of controls programmatically (in which case you might want to turn EnableViewState off for these controls) or you are using several data sources For example, if you have three views and each view has a different data source control, each time the page is posted back all three data source controls will perform their queries, and every view will be bound, including those that aren t currently visible To avoid this overhead, you can use the techniques described in 9, such as leaving your controls unbound and binding them programmatically, or canceling the binding process for views that aren t currently visible.

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.

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When you create a Connection object, you can pass the connection string as a constructor parameter. Alternatively, you can set the ConnectionString property by hand, as long as you do it before you attempt to open the connection. There s no reason to hard-code a connection string. As discussed in 5, the <connectionStrings> section of the web.config file is a handy place to store your connection strings. Here s an example: <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <connectionStrings> <add name="Northwind" connectionString= "Data Source=localhost;Initial Catalog=Northwind;Integrated Security=SSPI"/> </connectionStrings> ... </configuration> You can then retrieve your connection string by name from the WebConfiguration Manager.ConnectionStrings collection, like so: Dim connectionString As String = WebConfigurationManager.ConnectionStrings("Northwind").ConnectionString The following examples assume you ve added this connection string to your web.config file.

Of course, not all uses of the MultiView need to involve data binding The perfect scenario for the MultiView is an extended set of input controls for example, an online survey form that s split into separate views just to spare the user a lot of scrolling This example works well with the MultiView because at the end when the survey is complete, you can read all the data from the controls of every view..

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" />.

Once you ve chosen your connection string, managing the connection is easy you simply use the Open() and Close() methods. You can use the following code in the Page.Load event handler to test a connection and write its status to a label:

By default, the Wizard control supplies navigation buttons and a sidebar with links for each step on the left. You can hide the sidebar by setting the Wizard.DisplaySideBar property to false. Usually, you ll take this step if you want to enforce strict step-by-step navigation and prevent the user from jumping out of sequence. You supply the content for each step using any HTML or ASP .NET controls. Figure 16-4 shows the region where you can add content to an out-of-the-box Wizard instance.

Unfortunately, this syntax works only with server-side controls. If you want a similar effect with ordinary HTML, you need to change the link to a full relative path incorporating your domain name. This makes for ugly, unportable HTML, and it s not recommended.

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