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using System; using log4net; [assembly: Config.DOMConfigurator(Watch=true)] public class MainApp { public static void Main(string[] args) ILog log = LogManager.GetLogger( "2.Logging"); if (log.IsDebugEnabled) log.Debug("Hello world"); } } Let s walk through this. You reference the namespace log4net so you can use the log4net assembly. You must add the attribute [assembly: . . .] to enable the log4net listener. You use the listener to capture log4net messages that are then output to the logging outputs defined in the application configuration. If you don t activate the listener, logging isn t activated, and any logging messages made are lost. You can add the attribute to the main application, or to an assembly that s loaded by the main application. The location doesn t matter; it only matters that the attribute is executed. You make logging calls by calling methods on the ILog interface. You call the method LogManager.GetLogger to get an interface instance of ILog. The parameter "2.Logging" represents a logging configuration that s loaded from the application configuration file. Loading a logging configuration loads and defines logging levels. In the source code, the property IsDebugEnabled only returns true if the loaded configuration file has enabled the debug logging level. Otherwise, false is returned. If true is returned, then you can call the method log.Debug to indicate a logging message at the debug level. You can make logging method calls anywhere in the source code. However, only the configuration file determines whether or not logging output is generated. The configuration file determines which data is logged, and where that logged data is generated. In big-picture terms, the developer adds all the logging hooks, but the administrator determines what s logged and where. Following is an example modified application-configuration file that contains a minimal number of configuration entries that you can use to generate logging output: < xml version="1.0" encoding="utf-8" > <configuration> <configSections> <section name="log4net" type="System.Configuration.IgnoreSectionHandler" /> </configSections> <appSettings> </appSettings>
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<asp:TextBox ID="TextBox1" runat="server" Width="173px"></asp:TextBox> <cc1:CalendarExtender ID="CalendarExtender1" TargetControlID= "TextBox1" runat="server"> </cc1:CalendarExtender>
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Figure 6-9. Inheritance hierarchy for NameValueListBase<K,V> The ReadOnlyBindingList class extends BindingList<T>, adding the ability to have a read-only collection that fully supports data binding in WPF, Windows Forms, and Web Forms.
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Once FaceTime is enabled, you can place a FaceTime call from the FaceTime app or from the FaceTime button at the bottom of a contact page. FaceTime will only work, however, if the other caller is on an iPod touch or iPhone 4, and the FaceTime feature is enabled on both devices.
In your pivot table, Product is in the Row Labels area, Region is in the Column Labels area, and Quantity is in the Values area. You use a GetPivotData formula to return the total quantity sold for each product. With the OrderDate field in the Report Filter area, you can select an order date and see the quantity sold for the selected date. Some products may have no sales for the selected date, and they don t appear when the filter is applied. If you refer to these products in a GetPivotData formula, this results in #REF! errors being returned. You would like the formula to return a zero, instead of an error. This problem is based on the Missing.xlsx workbook.
Table 4-3. Continued
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