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NET never serves skin files directly instead, they re used behind the scenes to define a theme A skin file is essentially a list of control tags with a twist The control tags in a skin file don t need to completely define the control Instead, they need to set only the properties you want to standardize For example, if you re trying to apply a consistent color scheme, you might be interested in setting properties such as ForeColor and BackColor only When you add a control tag for the ListBox control, it might look like this: <asp:ListBox runat="server" ForeColor="White" BackColor="Orange"/> The runat="server" portion is always required Everything else is optional The id attribute is not allowed in a theme, because it s required to uniquely identify each control.

Public Property BannerText() As String Get Return lblTitleContentText End Get Set lblTitleContentText = Value End Set End Property The content page can now change the text The only caveat is that the Master property returns an object that s typed as the generic MasterPage class You need to cast it to your specific master page class to get access to any custom members you ve added Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Dim theMaster As CustomizableMasterPage _theMaster = CType(Master, CustomizableMasterPage) theMasterBannerText = "Content Page #1" End Sub Another way to get strongly typed access to the master page is to add the MasterType directive to the content page All you need to do is indicate the virtual path of the corresponding master file: <%@ MasterType VirtualPath="~/SiteTemplate.

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The design-time representation of your content pages can range from excellent to poor. For the simple header and footer example, you ll see a fairly good representation of your content page that includes all the elements of the master page and the additional content you ve added. The parts you ve acquired from the master page will be shaded in gray, indicating you can t select or change them in any way. Instead, you ll be limited to inserting comments into the ContentPlaceHolder region, as shown in Figure 15-12.

It s up to you whether you create multiple skin files or place all your control tags in a single skin file Both approaches are equivalent, because ASPNET treats all the skin files in a theme directory as part of the same theme definition Often, it makes sense to separate the control tags for complex controls (such as the data controls) into separate skin files Figure 15-2 shows the relationship between themes and skins in more detail..

master" %> Now you can use simpler strongly typed code when you access the master page: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) MasterBannerText = "Content Page #1" End Sub You should note one point about these examples When you navigate from page to another, all the web-page objects are re-created This means that even if you move to another content page that uses the same master page, ASP NET creates a different instance of the master page object As a result, the Text property of the Label control in the header is reset to its default value (a blank string) every time the user navigates to a new page To change this behavior, you need to store the information in another location (such as a cookie) and write initialization code in the master page to check for it.

If a master page defines a ContentPlaceHolder but your content page doesn t define a corresponding Content control, you ll see a black box in its place. To add the required Content control, right-click that section of the page and choose Create Custom Content.

ASP .NET also supports global themes. These are themes you place in the [WinDir]\ Microsoft.Net\Framework\[Version]\Themes folder. However, it s recommended that you use local themes, even if you want to create more than one website that has the same theme. Using local themes makes it easier to deploy your web application, and it gives you the flexibility of introducing site-specific differences in the future. If you have a local theme with the same name as a global theme, the local theme takes precedence, and the global theme is ignored. The themes are not merged together.

You can also get access to an individual control on a master page through brute force The trick is to use the MasterPageFindControl() method to search for the object you want based on its unique name When you have the control, you can then modify it directly Here s an example that uses this technique to look for a label: Dim lbl As Label lbl = MasterFindControl("lblTitleContent") If lbl IsNot Nothing Then lblText = "Content Page #1" End If Of course, this type of interaction breaks all the rules of proper class-based design and encapsulation If you really need to access a control in a master page, you are far better off wrapping it (or, ideally, just the properties you re interested in) by adding properties to your master page class.

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