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Figure 21-2. A menu that changes according to control focus Implementing this example is easy. The trick is that you can replace a top-level menu item with a context menu using code like this: mnuTopLevel.DropDown = mnuContext.DropDown; Assuming mnuTopLevel is a top-level menu (like File) in a MenuStrip, and mnuContext is a ContextMenuStrip, this single line populates the top-level menu with all the items in the context menu. The problem with this approach is that it doesn t change the top-level menu text. This example works around this limitation by binding to the first item in the context menu, rather than the entire context menu. In other words, it uses code like this: // Get the first item in the menu. ToolStripMenuItem item = (ToolStripMenuItem)mnuContext.Items[0]; // Copy the subitems from this item into the top-level menu. mnuTopLevel.DropDown = item.DropDown; // Copy the text from this item into the top-level menu. mnuReplaceable.Text = item.Text; This design assumes the menu you re moving into the top level is a submenu of the first item in the context menu. This allows you to define the menu items and the menu text.

Now that you re done, compile the new DAAB. Assuming you ve put in the appropriate documentationgenerating XML tags, you should be able successfully build the library. This will output the new DAAB library at this location:

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Perhaps in giving someone access based on an IP address range, the wildcard matching wasn t quite right, and access was granted to a much wider range of machines Lack of information about data: It might not be a lack of understanding of security practices that leaves data exposed, but lack of knowledge about the data itself Suppose your database server is managed by a third party in an off-site data center If the system administrator of the server isn t aware of the sensitive nature of your data, he may make a decision about security that puts your data at risk This may be as simple as copying a database backup to a remote machine over a publicly available network Communication issues: Lack of communication between application developers, database administrators, and data owners can lead to poor security practices.

Using this approach makes it easy to create the context menus and attach event handlers at design time. It s also easy to associate each menu with its corresponding panel through the Control.ContextMenuStrip property. In fact, you can use as many menus and panels as you want without complicating the design. Every panel can use the same code in the same event handler to perform the swap: private void panel_Enter(object sender, EventArgs e) { Panel panel = (Panel)sender; mnuTopLevel.DropDown = panel.ContextMenuStrip; ToolStripMenuItem item = (ToolStripMenuItem)panel.ContextMenuStrip.Items[0]; mnuTopLevel.DropDown = item.DropDown; mnuTopLevel.Text = item.Text; } If you decide to use an alternate approach (for example, menu merging with the ToolStripManager), you ll need to devise a way to associate a ToolStrip with a control, or you ll be forced to hard-code these relations in your form, which makes your code longer and much more difficult to maintain. This challenge is a prime candidate for a custom property extender (as described in 25). With a custom property extender, you could add properties like AssociatedToolStrip and MergeToolStripOnFocus to every panel control. Once you set these properties, the property extender takes care of listening for the focus change events, getting the related ToolStrip, and performing the merge operation. To learn more about how to implement a property extender, see 25.

It s all well and good to assemble a menu out of bits and pieces in response to specific events, but it s even more interesting if the information is drawn from an external source. The following example uses a database table that maps user levels to control access permissions. Depending on the user type, some options may be disabled or hidden entirely. The database uses three tables (see Figure 21-3). Controls lists the names of available controls in the user interface, Levels lists the supported user levels, and Controls_Levels specifies what controls are allowed for a given user level (using a special State field that indicates 0 for normal, 1 for hidden, and 2 for disabled). All controls are enabled by default, so the only records that need to be added to Controls_Levels are those that specifically hide or disable controls. In a full-blown application, there would probably also be a Users table that indicates what level each user has.

You re now ready to use the ODP.NET DAO in your projects. The first thing you need to do is to create a new Windows Forms Application project. After that, add two references to the project: Microsoft.Practices.EnterpriseLibrary.Common Microsoft.Practices.EnterpriseLibrary.Data (or browse for the new assembly you ve just created) These references contain the changes you ve made earlier. The Microsoft Enterprise Library also uses an application configuration file (app.config) to store the database connection details such as the connection string and provider name. You don t actually have to edit this file by hand; the Microsoft Enterprise Library comes with an Enterprise Library Configuration tool that allows you to generate the entries needed for the DAAB to work.

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