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To use Solver to determine the most profitable mix of electronic equipment to build, do the following: 1. Click Tools Solver. 2. Click Reset All, and then click OK to clear Solver s existing settings. 3. Click the Set Target Cell box, and then click cell D18 (Total Profits By Product). 4. Click Max. 5. Click the By Changing Cells box, and then select cells D9 through F9 (Number to Build for TV Sets, Stereos, and Speakers). 6. Click Add. 7. Click the Cell Reference box, and then select cells C11 through C15 (Number Used). 8. Click the Constraint box, and then select cells B11 through B15 (Inventory). 9. Click Add. This constraint ensures that you will not allocate more parts than are in your inventory.

Partial classes make it simple to separate functionality into various source code files, where the modification of one source code file does not affect another source code file. This example demonstrates using partial classes to manipulate internal state of a class without violating the do-not-expose-internal-state rule. Another use of partial classes is in the context of

is closed. In our solution, you ll load all the data returned by the SqlDataReader into a DataTable object (which is capable of storing the data offline without needing an open connection), which will allow you to close the database connection very quickly. The DataTable class can store a result set locally without needing an open connection to SQL Server, and it isn t data provider specific, like the other ADO.NET objects mentioned so far (whose names begin with Sql because they re SQL Server specific).

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Tip A parent of the DataTable object is the DataSet, which is a very smart object that represents something like an in-memory database. DataSet is capable of storing data tables, their data types, relationships between tables, and so on. Because of their complexity, DataSets consume a lot of memory, so it s good to avoid them when possible. We won t use any DataSets when building BalloonShop.

The ExchangeRate property is one of the pieces of shared functionality. Another piece of shared functionality we want to implement is the calculation of the exchange rate. We ll do this with ConvertValue() and ConvertValueInverse() methods, which convert a currency from one value to another using multiplication. The following shows the methods in the completed base class implementation of CurrencyTrader. public abstract class CurrencyTrader { private double _exchangeRate; protected double ExchangeRate { get { return _exchangeRate; } set { _exchangeRate = value; } } protected double ConvertValue(double input) { return _exchangeRate * input; } protected double ConvertValueInverse(double input) { return input / _exchangeRate; } } The bolded code highlights the methods that convert the currency from one unit to another. Notice that there is no declaration of currency units, because the base class is a utility class used to help us realize an active trader or hotel trader implementation.

Here s a simple example of reading some records from the database and saving them to a DataTable: // Open the connection conn.Open(); // Create the SqlDataReader object by executing the command SqlDataReader reader = comm.ExecuteReader(); // Create a new DataTable and populate it from the SqlDataReader DataTable table = new DataTable(); table.Load(reader); // Close the reader and the connection reader.Close(); conn.Close();

So far in the examples, we ve used classes whose names start with Sql: SqlConnection, SqlCommand, and SqlDataReader. These objects and all the others whose names start with Sql are specifically created for SQL Server, and are part of the SQL Server Managed Data Provider. The SQL Server Managed Data Provider is the low-level interface between the database and your program. The ADO.NET objects that use this provider are grouped in the System.Data.SqlClient namespace, so you need to import this namespace when you need to access these classes directly. The .NET Framework ships with managed data providers for SQL Server (System.Data. SqlClient namespaces), Oracle (System.Data.Oracle), OLE DB (System.Data.OleDb), and ODBC (System.Data.Odbc). To keep your application as independent as possible to the backend database, we ll use a trick to avoid using database-specific classes, such as SqlConnection. Instead, we ll let the application decide at runtime which provider to use, depending on the connection string provided.

Note Base class functionality, even when appearing trivial, is defined to ensure consistency in implementation. Without consistency, you encounter the problem where one implementation does one thing and another implementation does something completely different.

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