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{ while (dr.Read()) { Add(new NameValueListBase<int, string>. NameValuePair(dr.GetInt32(0), dr.GetString(1))); } } IsReadOnly = true; RaiseListChangedEvents = true; } #endregion } The Factory Methods region declares a static field to hold the list once it is retrieved. Notice how the factory method returns the cached list if it is present; only calling the data portal to retrieve the data if the list is null. There s also an InvalidateCache() method that can be called to force a reload of the data if needed. This caching behavior is optional if it doesn t fit your need, then use a factory method like this: public static NameValueList GetNameValueList() { return = DataPortal.Fetch<NameValueList>( new Criteria(typeof(NameValueList))); } The Data Access region contains only a DataPortal_Fetch() method, which connects to the database and retrieves the name/value data. The NameValueListBase class defines a strongly typed NameValuePair class, which is used to store each element of data. For each row of data from the database, a NameValuePair object is created and added to the collection. Notice the use of the IsReadOnly property to temporarily unlock the collection and then relock it so it becomes read-only once the data has been loaded. The RoleList class in the sample application in 8 illustrates a complete implementation of a name/value list.

Once we have added an Assert statement, we can test until we find where the zero value arises and then remove the Assert method call. It would be nice if we could leave the statement there. After all, if the zero value is a big deal, then we always want to know when it arises. But such a statement will provide a miniscule amount of drag on the performance of our program, and we don t want our users to see the dialog box that is displayed when a zero value does arise. Fortunately, we don t need to remove the Assert statement. It is removed for us when we compile our program for release. When you create a new project, Visual Studio configures it such that the Debug build mode is used. This includes all sorts of additional information that is useful for debugging your program. All that additional information is striped out when you switch to the Release mode, and so are the calls to the Debug class. To switch to the Release mode, select the Configuration Manager item from the Build menu. This will show the Configuration Manager dialog box, as shown by Figure 38-3. Click the item in the Configuration column for the project you want to change, and select Release from the drop-down list.

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Compiling the New Content Pipeline Project During the next step, you re going to link the assemblies of this new project to your main project, so you first need to compile the project into an assembly. Pressing F6 will do this; pressing F5 will build the assembly and afterward run the whole solution.

For each pixel, the graphics card will calculate the amount of lighting that should be applied to that pixel, as described earlier. Next, the graphics card multiplies this amount of lighting with the original color of that pixel.

want to have a very detailed specification of exactly, precisely, what is in there. I never answer those questions. Instead, I focus on the intent of redo and undo, the concepts behind redo and undo. I focus on the use of redo and undo not on the bits and bytes. I myself do not dump redo log files or undo segments. I do use the supplied tools, such as Log Miner to read redo and flashback transaction history to read undo, but that presents the information to me in a human-readable format. So, we won t be doing internals in this chapter but rather building a strong foundation.

It is important that you also ensure that the security on the virtual root itself (within IIS) is configured to allow anonymous users. If IIS blocks anonymous users, then it doesn t really matter what kind of security you use within ASP.NET.

(.txt) type. The selected file is opened locally and the content is read as a StreamReader object. The read content is set to the Text property of TextBlock to display it: private void Button_Click(object sender, RoutedEventArgs e) { OpenFileDialog opendlg = new OpenFileDialog(); opendlg.Filter = "Text files|*.txt"; opendlg.Multiselect = false; if ((bool)opendlg.ShowDialog()) { using (StreamReader reader = new StreamReader(dlg.File.OpenRead())) { txtContents.Text = reader.ReadToEnd(); reader.Close(); } } } Note that you need to add the reference to the System.IO namespace in order to create an instance of the StreamReader object.

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