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In previous chapters, we used a number of techniques to create DataTables as part of a DataSet we used the Fill method of the DataAdapter, the Add method of the DataSet, and the Table Collection Editor that s part of Microsoft Visual Studio .NET. Tables can also be created for Typed DataSets by using the XML Schema Designer in Visual Studio, as we ll see in Part V. In this chapter, we ll concentrate on creating DataTables at run time, using the DataSet s Add method and the DataTable s New constructor. Roadmap Run-time DataTables can also be created by using the DataSet s ReadXML, ReadXMLSchema, and InferXmlSchema methods. We ll examine those in 14. Creating Independent DataTables Although DataTa bles are most often used as part of a DataSet, they can be created independently. You might want to create an independent DataTable to provide data for a bound control, for example, or simply so that it can be configured before being added to the DataSet. The three forms of the DataTable s New constructor are shown in Table 7-1. Of these, only the first two are typically used in application programs. Table 7-1: DataTable Constructors Method New() Description Creates a new DataTable Creates a new DataTable with the name specified in the TableName string Used internally by the .NET Framework

Disk reliability problems can vary in severity Minor problems can cause seemingly random application failures For example, if a user connects a new camera and the operating system fails to load the driver, disk corruption may be causing the problem More severe problems can result in the total loss of data stored on the hard disk Windows can eliminate much of the impact of a disk failure by detecting disk problems proactively, before total failure occurs Hard disks often show warning signs before failure, but earlier Windows operating systems did not record the warning signs Windows now checks for evidence that a hard disk is beginning to fail and warns the user or the Support Center of the problem The IT department can then back up the data and replace the hard disk before the problem becomes an emergency .

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For administrators, Windows acts as a guide through the process of backing up their data so that they can replace the drive without data loss Most new hard disks include Self-Monitoring Analysis and Reporting Technology (SMART) and Disk Self Tests (DSTs) SMART monitors the health of the disk using a set of degradable attributes, such as head-flying height and bad block reallocation count DSTs actively check for failures by performing read, write, and servo tests Windows queries for SMART status on an hourly basis and regularly schedules DSTs If Windows detects impending disk failure, Windows can start disk diagnostics to guide the user or IT professionals through the process of backing up the data and replacing the disk before total failure occurs Windows can also detect problems related to a dirty or scratched CD or DVD and instruct the user to clean the media .

To use events in an application, the WithEvents keyword must be included when the object is defined. Without the WithEvents keyword, all events will be ignored. The following statement shows how you would declare an object with events:

You can configure disk diagnostics using two Group Policy settings Both are located in Computer Configuration\Policies\Administrative Templates\System\Troubleshooting And Diagnostics\Disk Diagnostic ..

Disk Diagnostic: Configure Execution level Use this policy to enable or disable disk diagnostic warnings . Disabling this policy does not disable disk diagnostics; it simply blocks disk diagnostics from displaying a message to the user and taking any corrective action . If you have configured a monitoring infrastructure to collect disk diagnostic events recorded to the event log and prefer to manually respond to events, you can disable this policy . Disk Diagnostic: Configure Custom Alert Text Enable this property to define custom alert text (up to 512 characters) in the disk diagnostic message that appears when a disk reports a SMART fault .

Although you need not mark your subroutines or functions as Private in a class, you should note that without the Private keyword, any subroutine or function will default to Public. In many situations, this might not be a serious problem, especially if you are the one person using the class. However, if you plan to share your class with others, you might find them relying on a routine where you accidentally omitted the Private keyword, which means you can t change the definition of the routine without impacting all the programs that use it.

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