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Now that we have demonstrated a web form taking advantage of the various client-side state management techniques, we transition to using it inside server controls. Taking into account all the client-side state facilities available, we strongly recommended that you follow the lead of the prebuilt controls in ASP.NET and use ViewState and control state within your server controls. With extensive support in the ASP.NET framework, using ViewState in custom control development will greatly reduce development time and ensure consistent behavior. Likewise, using the new control state functionality in ASP.NET 2.0 and later helps ensure consistent server control behavior whether or not ViewState is enabled; we cover control state later in this chapter.

A good way to start learning about macros is to use the record facility and then look at the code it generates. Select Tool Macros Macro Explorer to see a window that shows a tree of macro modules and the macros they contain (see Figure 2-27). Each macro corresponds to a Visual Basic subroutine. (Unfortunately, C# is not supported.) To edit the macro you just created, right-click the TemporaryMacro subroutine in the RecordingModule, and select Edit.

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Figure 2-27. The Macro Explorer Macro code uses a special DTE (design-time environment) object model. The DTE hierarchy provides the core features that allow you to interact with every aspect of the IDE. Some of the ingredients at your fingertips include the following: Window objects (used to close, rearrange, or otherwise manipulate open windows) Document objects (used to edit text) Solution and project objects (used to manage the underlying files and project collection) Tool-window objects (used to configure the IDE s interface) Debugging objects (used for tasks such as creating breakpoints and halting execution) Event objects (used to react to IDE events) Code-manipulation objects (used to analyze your project s code constructs) For example, the following macro automatically lists all the files in the project that have been modified but not saved. The list is shown in the Output window. Sub ListModifiedDocuments() Dim win As Window = DTE.Windows.Item(Constants.vsWindowKindCommandWindow) Dim target As Object ' If the current window is an Output window, use it. Otherwise, use a ' helper function to find and activate the window. If (DTE.ActiveWindow Is win) Then target = win.Object Else target = GetOutputWindowPane( Modified Documents ) target.clear() End If ' Loop through all the open documents, and if unsaved changes are detected, ' write the document name to the Output window. Dim doc As Document For Each doc In DTE.Documents If Not doc.Saved Then target.OutputString(doc.Name & " " & doc.FullName & _ Microsoft.VisualBasic.Constants.vbCrLf) End If Next End Sub

Although there are check boxes for allowing and denying permissions, there are actually three settings for NTFS permissions. You can explicitly allow a permission by checking the Allow check box. You can explicitly deny a permission by checking the Deny box. Or you can implicitly deny a permission by not checking anything. When NTFS checks permissions, it does so by first checking whether or not the permission is explicitly denied, then whether or not the permission is explicitly allowed. If it is neither denied nor allowed, then it is implicitly denied because it was not allowed. Explicit denial has serious ramifications because account permissions are an aggregate of the account permissions and any group permissions with which the account is associated. If an account is explicitly allowed permission to access a certain file, but is part of a group that is explicitly denied access to the file, then the user will be denied access to that file. This is why Microsoft recommends that you use implicit denial instead of explicit denial unless you have a compelling reason to do otherwise.

Each node in the tree is represented by a TreeNode object. As you already know, every TreeNode has an associated piece of text, which is displayed in the tree. The TreeNode object also provides navigation properties such as ChildNodes (the collection of nodes it contains) and Parent (the containing node, one level up the tree). Along with this bare minimum, the TreeNode provides all the useful properties detailed in Table 16-9. Table 16-9. TreeNode Properties

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