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10. Click the Cell Reference box, and then select cells D9 through F9 (Number to Build for TV Sets, Stereos, and Speakers). 11. In the operator list, select >=. 12. Click the Constraint box, and then type the number 0. 13. Click OK. This constraint ensures that you will not produce a negative number of electronic items in any category. 14. Click Options. 15. Clear the Assume Linear Model check box, and then click OK. You need to do this because the model is nonlinear (due to the factor in cell H15, which shows that profit per unit diminishes with volume). 16. Click Solve. Compare your results to Figure 4-35.

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Tip If you re familiar with object-oriented programming (OOP) theory, you ll find it interesting to hear this

This completes our test code. Now we will implement the active trader and hotel trader components of the currency exchange application.

extra bit of information. In our code, we ll use database-agnostic classes, such as DbConnection and DbCommand, instead of SqlConnection and SqlCommand. At execution time, objects of these classes will contain instances of their database-specific variants, through polymorphism. As a result, for example, calling a method on the DbConnection class will have the similar method from SqlConnection executed. Using this trick, if you change the backend database, the compiled code keeps working with absolutely no changes, as long as the stored procedures are implemented the same under the new database. You can download some free material on OOP with C# from my personal web site, at http://www.cristiandarie.ro.

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With the TestCurrencyTrader test solution completed, it s time to turn our attention to the CurrencyTrader solution. As mentioned earlier, this consists of the active trader and hotel trader currency converter components. Here, you ll see more clearly what it means to use inheritance.

Although using SQL Server specific classes was better for the sake of keeping examples simple, in practice we ll use a method that doesn t make the C# code depend (in theory, at least) on a specific database server product The new ADONET classes that allow for generic data access functionality such as DbConnection, DbCommand, and so on are grouped under the SystemDataCommon namespace The first step in implementing database-agnostic data access is to use the DbProviderFactory class to create a new database provider factory object: // Create a new database provider factory DbProviderFactory factory = DbProviderFactoriesGetFactory("SystemDataSqlClient"); This piece of code, because of the SystemDataSqlClient parameter passed, will have the factory object contain a SQL Server database provider factory (the term factory generally refers to a class that builds class instances, or objects, for you) In practice, the SystemData.

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The ActiveCurrencyTrader class implements the logic of the active currency trader. To begin, we ll add its constructor.

Figure 4-35. The Product Mix Solver sample worksheet after using Solver to forecast the most profitable mix of electronic equipment to build given several constraints

SqlClient string parameter is kept in a configuration file, allowing you to have C# code that really doesn t know what kind of database it s dealing with The database provider factory class is capable of creating a database-specific connection object through its CreateConnection method However, you ll keep the reference to the connection object stored using the generic DbConnection reference: // Obtain a database-specific connection object DbConnection conn = factoryCreateConnection(); So, in practice, the connection object will actually contain a SqlConnection object if the backend database is SQL Server, an OracleConnection if the backend database is Oracle, and so on However, instead of working with SqlConnection or OracleConnection objects, we simply use DbConnection and let it decide at runtime what kind of object to create in the background.

To give ActiveCurrencyTrader some default state, we use a constructor. However, the constructor will serve another purpose, in that any class that instantiates ActiveCurrencyTrader will consider the instance as immutable. Immutable means that once data has been assigned to the instance, it cannot be altered. In other words, it is unchangeable.

After you have a connection object, you can simply set its properties the familiar way, just as you would with a normal connection object: // Set the connection string connConnectionString = ".. connection string .."; Okay, so you have the connection, but what about executing the command Well, it just so happens that the connection object has a method named CreateCommand that returns a database command object Just like with the connection object, CreateCommand returns a database-specific.

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winforms pdf 417

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winforms pdf 417

winforms pdf 417

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winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417

winforms pdf 417