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Figure 21-1. Dynamic content in the About box Usually, you ll decide between dynamic content and dynamic control creation based on the type of information you need to display and how much it varies.

A more interesting example of dynamic content is an adaptable menu. Some Windows programming frameworks (like MFC) include the concept of changing a menu as different controls get focus. Although .NET doesn t include this functionality, you can build it yourself. Before you begin, you need to consider how your menu will vary. Key considerations include whether you need to change one submenu or several; whether you need to change toolbars as well as menus; and whether you want to replace the menu with a completely different one, or simply add or hide individual items. Once you ve identified your design, you need to decide how to implement it. You ll need to react to the focus events Enter and Leave to change the menu as the user moves from one control to another. To actually change the menu, you can use one of three common techniques: Programmatic menu merging. In this case, you use the ToolStripManager.Merge() method to trigger automatic menu merging. Menu merging is described in 19. Replacing submenus with context menus. In this case, you create multiple context menus, and simply assign them to parts of the main menu. Hiding and showing individual items. In this case, you simply tweak the Enabled or Visible property of the appropriate ToolStripMenuItem object.

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Why are we so interested in security practices To answer that question, we need to address three other questions.

// try to short circuit by default name if (DbProviderMapping.DefaultSqlProviderName.Equals(dbProviderName)) return defaultSqlMapping; if (DbProviderMapping.DefaultOracleProviderName.Equals(dbProviderName)) return defaultOracleMapping; if (DbProviderMapping.DefaultOracleNETProviderName.Equals(dbProviderName)) return defaultOracleNETMapping; // get the default based on type DbProviderFactory providerFactory = DbProviderFactories.GetFactory(dbProviderName); ValidateDbProviderFactory(name, providerFactory); if (SqlClientFactory.Instance == providerFactory) return defaultSqlMapping; if (System.Data.OracleClient.OracleClientFactory.Instance == providerFactory) return defaultOracleMapping; if (OracleClientFactory.Instance == providerFactory) return defaultOracleMapping; return null; }

The following example uses the second (context menu) approach. The next section shows a more ambitious example that uses the third approach. When designing an adaptable menu, you don t necessarily need to tailor the menu for individual controls. It many cases, you ll only want to have a small set of menus, and use each one for a group of controls. The easiest way to implement this design is to arrange your controls into some sort of container, like a panel. Consider the form shown in Figure 21-2. The second top-level menu varies depending on whether the focus is somewhere in the first panel or somewhere in the second.

These days, we are constantly warned about computer exploits and ways to protect against them Despite this barrage of information, we still learn of, or experience firsthand, security breaches of various types Why does this continue to happen In relation to databases and database applications, we think the following are some of the common reasons for security problems: Time constraints: Time is a major factor in the attention given to security Many managers will be pushing for the next piece of functionality before the current one is complete, leaving developers and administrators no time to give attention to making sure things are locked down Lack of security knowledge: Developers and administrators might not know enough about security in general or lack awareness of the specifics of database access controls.

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