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In fact, I can think of only one reason you ll ever need to use a macro: You must write an AutoKeys macro to define any keystrokes that you want to intercept globally in your application. In many cases, you ll find that using Visual Basic code in the KeyPress event of your forms works just as well. In 24, The Finishing Touches, you ll learn how to create an AutoKeys macro.

Although macros can be useful, a number of tasks cannot be carried out with macros, and there are others that are better implemented using a Visual Basic procedure. Use a Visual Basic procedure instead of a macro in any of the following circumstances:

You need discrete error handling in your application. You want to define a new function. You need to handle events that pass parameters or accept return values (other than

Cancel).

Using the other aggregate methods is just as easy. Listing 6.15 aggregates the total price, lowest price, highest price, and average price for the books grouped by each subject.

automation or Dynamic Data Exchange (DDE).

You want to be able to directly call Windows API functions. You want to define application code that is common across several applications in a

tem that handles your attached tables (such as SQL Server procedures or data definition facilities).

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You want maximum performance in your application. Because modules are compiled,

Table<Book> books = dataContext.GetTable<Book>(); var query = from book in books group book by book.SubjectId into groupedBooks select new { groupedBooks.Key, TotalPrice = groupedBooks.Sum(b => b.Price), LowPrice = groupedBooks.Min(b => b.Price), HighPrice = groupedBooks.Max(b => b.Price), AveragePrice = groupedBooks.Average(b => b.Price) };

they execute slightly faster than macros. You ll probably notice a difference only on slower processors.

Quite frankly, the ability to trap errors in Visual Basic should be reason enough to use Visual Basic instead of macros. For example, the only way to test some conditions is to set an error trap and then attempt to execute the statement that depends on the condition you want to test. If you trap an error, then you know that the condition failed, and you can write code to deal with the problem.

You can do a lot to help make sure the user of your application enters correct data by defining default values, input masks, and validation rules. But what can you do if the default values come from a related table How can you assist a user who needs to enter a value that s not in the row source of a combo box How do you ensure that the user enters a hyperlink in the correct format Is there a way you can make it easier for your user to pick dates and times And how do you show and help the user edit linked picture files You can find the answers to these questions in the following sections.

Once again, the aggregation methods are translated into the appropriate SQL and the aggregation is performed in the database itself. The database only returns the results that we ask for, limiting the amount of data that needs to be returned. Throughout our discussion so far, we ve been limited to working only with values from a single table. It would be nice if we could join our Book table with the corresponding Subject table so that we could include the descriptive name of the subject rather than the cryptic unique identifier contained in the Book table. Naturally, LINQ to SQL offers several options for joining our results.

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