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One limitation in your current example is that there is no way to handle data that need to be formatted before they can be displayed. For example, the UnitCost is displayed in the form 1.9900 instead of the more appropriate currency string $1.99. Luckily, it s quite easy to change this detail. If the conversion you want to perform involves converting a number or date into an appropriate string representation, you can use an overloaded version of the ControlBindingsCollection.Add() that accepts a format string. For example, instead of using this code: txtUnitCost.DataBindings.Add("Text", products, "UnitCost"); Use this: txtUnitCost.DataBindings.Add("Text", products, "UnitCost", true, DataSourceUpdateMode.OnValidation, 0, "C"); There are several extra parameters at work here. The first new parameter (true) enables formatting. The next parameter specifies the default update mode, which applies changes to the bound object after validation is performed. This doesn t represent a change, but a value is required for this version of the Add() method. The following parameter (0) sets the value that s used if the bound field is null, and the final string sets the format (C for currency), which ensures the UnitCost field is displayed with a currency symbol and two decimal places (see Figure 8-11).

the database. Securing a database isn t just about hiding data. It s about preventing unauthorized changes in the data, as well as keeping the data available. It s also about protecting the server from compromise through the database. In the end, there aren t many operators of databases-driven systems that don t care if their system is down.

Figure 8-11. Formatting numbers to strings You can learn about all the format strings that are available in the MSDN Help. However, Table 8-3 and Table 8-4 show some of the most common options you ll use for numeric and date values, respectively.

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You will see your application as a node in the right pane with the Data Access Application Block node directly under it. You need to create a connection string entry so that you can connect to Oracle. Expand your Data Access Application Block node, and right-click the Connection Strings node. Choose the New Connection String menu item in the ensuing pop-up menu to generate a new connection string entry. In the properties window shown in Figure 13-3, change the Name field to ProductsDatabase, choose Oracle.DataAccess.Client as the ProviderName, and specify your full ODP.NET connection string. You can use the same connection string you ve been using for the earlier chapters of this book.

$1,234.50 Brackets indicate negative values: ($1,234.50). The currency sign is locale-specific. 1.234.50E+004 45.6% Depends on the number of decimal places you set. F3 formats values like 123.400. F0 formats values like 123.

It is important not only to acknowledge the fact that you might not be practicing good security, but also to determine how to resolve the deficiency. If lack of knowledge or understanding about security is one reason you have holes in your database, then do some more reading (starting with the rest of this chapter), join appropriate mailing lists, and/or attend a security conference (or a database conference with a security track). If the major barrier is time, tell your manager that there may be some security issues with the database that could lead to disaster and you would like a few days to research and resolve them. Security incidents are never pleasant and can lead to drastic things like termination of employment. Whatever the issue, find a way to get through it so you can move forward with a clear conscience about your system, and keep your job, too.

Note You can also create multiple connection string entries. You will be able to choose which connection you wish to use later on in code. You can also specify the default database in the right pane of the tool window when you highlight the Data Access Application Block node.

M/d/yyyy (for example: 10/30/2005) dddd, MMMM dd, yyyy (for example: Monday, January 30, 2005) dddd, MMMM dd, yyyy HH:mm aa (for example: Monday, January 30, 2005 10:00 AM)

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