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Now, another override of the Fill method that accepts a table name exists, but this name applies to the first table retrieved, leaving the rest of the tables with autogenerated names ( Table for the first DataTable, then Table1, Table2, through Tablen ) Using the override where no name is provided, and then explicitly naming the tables after the fact provides for more readable code Naming them is a good idea; they should be referred to in the rest of the code with explicit names instead of ordinal positions Here s a case where the increased ease of maintenance using named tables exceeds the miniscule performance gain that would be gleamed by using ordinal positions You can then use the named tables to establish the relationship between them This corresponds directly to the primary and foreign key relationship that exists between them in the database.

.FirstOrDefault(p => p == "Salary"); if (salaryProp != null) { var originalSalary = Convert.ToDecimal( entry.OriginalValues[salaryProp]); var currentSalary = Convert.ToDecimal( entry.CurrentValues[salaryProp]); if (originalSalary != currentSalary) { if (currentSalary > originalSalary * 1.1M) throw new ApplicationException( "Can't increase salary more than 10%"); } } } } } The following is the output of the code in Listing 12-8: Oops, tried to increase a salary too much!

Note If you do have the time or the inclination to automate the scenario tests, there s benefit in doing so the success or failure of the project won t depend on it, though (unlike with more fragile over agile processes such as XP). We consider automated scenario tests to be an advanced topic, so we cover that in 11.

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A DataRelation will enforce the same rules on DataTables that a primary/foreign key relationship enforces within a database At the point this relation is created, the DataSet checks the existing data to make sure the data complies with the rule, and then enforces the rule as changes are made to the data You could not, for example, delete a publisher that had corresponding rows in the titles table You ll use this relationship to find all of the titles that belong to the publisher your user selects Although this code is to be part of a code-behind for this example, this pattern will still work just fine when you re using a data access tier The check in the cache can be done, and when it s not found, the DataSet can be retrieved by a call to a data access layer helper method (or a Web Service method).

In the SavingChanges event handler, we first retrieve all the object state entries for the Employee entity that are in the modified state. For each of them, we look for a modified Salary property. If we find that the Salary property has been modified, we retrieve both its current value, which represents the value after modification, and its original value. If they differ, we check to see if they differ by more than 10%. If they do, then we throw an ApplicationException. Otherwise, we simply return and let Entity Framework save the changes to the database.

In this chapter we ll show you how to identify and generate scenario tests from structured use case scenarios, as usual using the Mapplet as an example, and using Enterprise Architect (EA) for tools support. The chapter is structured around our top ten scenario testing to-do list.

You have an independent association. You want to retrieve the original association prior to saving the changes to the database.

The other common modification that you can make to this method is to break it out into a static method in a stand-alone helper class, so that it will be available from more than one page We re going to show you how to use this data to create a list of publishers, and when a choice is made from the list, render a GridView with all of the titles from the publisher To do this, you ll leverage DataViews and DataSet relations Here s the simple markup for our page (from DataSetIEaspx in Web10): <%@ Page Language="C#" CompileWith="DataSetIEaspxcs" ClassName="DataSetIE_aspx" %> <html xmlns="http://wwww3org/1999/xhtml" >.

Suppose you have a model representing an order and the order s status (see Figure 12-12). The fulfillment of an order goes through three stages, as represented in the OrderStatus entity. First, the order is assembled. Next, the order is tested. Finally, the order is shipped. Your application has a business rule that confines all orders to this three-step process. You want to enforce this rule by throwing an exception if an order goes, for example, from assemble to ship without first being tested. The association between Order and OrderStatus is an independent association.

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