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using System;

The Windows operating system has a rather kludgey feature called large fonts that allows you to bump up the default text size on your computer. This feature is designed to let you use higher resolutions for increased quality without sacrificing readability. However, most users steer away from the large fonts feature because it works unpredictably with many applications. Some become unusable (important content may be bumped right off a form) while most show no change at all.

Have you noticed that you haven t seen a way to change global or table-level privileges The default behavior of MySQL Administrator is to not show these privilege levels. To turn them on, select File Preferences, and then click the Administrator icon. Under User Administration, check the Show global privilege editor and Show table/column privilege editor options, as shown in Figure 15-12. Click the Apply Changes button, and then click Close. You ll now notice two additional tabs when you click a user account. Selecting the Global Privileges tab, shown in Figure 15-13, gives you the ability to assign permissions on a global level.

Tip To change the font DPI on your computer, select Display from the Control Panel, choose the Settings

using using using using using using using using using using System.Data; System.Data.Common; Oracle.DataAccess.Client; System.Security.Permissions; System.Transactions; System.Xml; Microsoft.Practices.EnterpriseLibrary.Common.Configuration.Unity; Microsoft.Practices.EnterpriseLibrary.Data.Configuration; Microsoft.Practices.EnterpriseLibrary.Data.Configuration.Unity; Microsoft.Practices.EnterpriseLibrary.Data.Properties;

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tab, and click Advanced. In the General tab, there s a drop-down list of DPI options, including normal-size and large-size fonts.

Caution Remember that global privileges override all others. Be careful what you assign through MySQL

By default, your .NET applications won t change when large fonts are used. However, you can choose to support this feature by setting the Font property of your form to SystemFonts. IconTitleFont. As odd as it seems, this is the correct font to support default text it s the font that Visual Studio uses for its dialogs. Additionally, you should handle the UserPreferenceChanged event to refresh the font immediately when the user changes the font DPI setting (no reboot is required). Here s what your code should look like:

namespace Microsoft.Practices.EnterpriseLibrary.Data.OracleNET { [OraclePermission(SecurityAction.Demand)] [DatabaseAssembler(typeof(OracleNETDatabaseAssembler))] [ContainerPolicyCreator(typeof(OracleNETDatabasePolicyCreator))] public class OracleNETDatabase : Database { public OracleNETDatabase(string connectionString) : base(connectionString, OracleClientFactory.Instance) { } protected char ParameterToken { get { return '@'; } } public XmlReader ExecuteXmlReader(OracleCommand command) { OracleCommand OracleCommand = CheckIfOracleCommand(command); ConnectionWrapper wrapper = GetOpenConnection(false); PrepareCommand(command, wrapper.Connection);

Similarly, you can change table and column privileges by selecting the Table/Column Privileges tab, as shown in Figure 15-14. You can select a table or column by clicking the appropriate schema in the left pane and drilling down to the object of interest. The Available Privileges list displays the privileges available for each object you click.

Figure 20-8. Tracking progress for an asynchronous task This approach breaks the clean separation between data processing and the user interface layer, and it tightly couples your Worker component to a particular asynchronous implementation (in this case, the one provided by the BackgroundWorker component). Ideally, you could avoid this complexity by using an interface (say, IReportProgress) that could be implemented by the BackgroundWorker and other classes. Sadly, the BackgroundWorker doesn t use any such interface. The only way to properly correct the problem is to create your own asynchronous implementation that does use an interface (see the section on custom-threaded classes later in this chapter). However, you can improve the situation a bit by making sure the BackgroundWorker supports alternate approaches, including invocation without a BackgroundWorker. To keep compatibility with the earlier examples, you can add an overload to the FindPrimes() method that takes the original two parameters. It can then call the other version of FindPrimes() to perform the actual work: public static int[] FindPrimes(int fromNumber, int toNumber) { return FindPrimes(fromNumber, toNumber, null); } The Worker component is still tightly coupled to the BackgroundWorker, but by factoring your code a bit more and providing overloaded versions of the FindPrimes()method, you buy yourself some valuable flexibility.

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