winforms data matrix

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The CreateCommand method uses the steps presented earlier in this chapter to create a command object specific to the database implementation you re working with, wrap that instance into a generic DbCommand reference, and return this reference This way, external classes will be able to call CreateCommand to get an already configured with a prepared connection DbCommand object ExecuteSelectCommand, which is essentially a wrapper for DbCommand s ExecuteReader method, except it returns the results as a DataTable instead of a DataReader Using the DataTable ensures that the database connection is kept open as short as possible In this method, you implement an errorhandling technique that guarantees that in case of an exception, the administrator is informed by email (if the application is configured to do so), the database connection is properly closed, and the error is rethrown.

CHAPTER 1 READY, STEADY, GO!

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In this example, you must trade off the higher interest rates available from longer-term investments against the flexibility provided by keeping funds in short-term investments. This model calculates ending cash based on initial cash from the previous month, inflows from maturing CDs, outflows for new CDs, and cash needed for company operations for each month. In this model, you have a total of nine decisions to make: The amounts to invest in one-month CDs in months 1 through 6 The amounts to invest in three-month CDs in months 1 and 4 The amount to invest in six-month CDs in month 1 To use Solver to forecast maximized interest income while meeting company cash requirements, 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 H8 (Total Interest Earned). 4. Click Max. 5. Click the By Changing Cells box. Then select cells B14 through G14, press and hold down the Ctrl key, and click cells B15, E15, and B16 (CD Investments for One-Month CDs in Months 1 Through 6, Three-Month CDs in Months 1 and 4, and Six-Month CDs in Month 1). 6. Click Add. 7. Click the Cell Reference box, and then select cells B14 through G14 (CD Investments for One-Month CDs in Months 1 Through 6). 8. In the operator list, select >=.

We decided to let the error propagate because this class is at too low a level to know how to properly handle the errors At this point, we re only interested in keeping the database safe (by closing the connection) and reporting any eventual error The best example of how a client class can use GenericDataAccess to work with the BalloonShop database is the GetDepartments method in the CatalogAccess class..

To make one project aware of definitions in another project, you need to define a reference. The idea behind a reference is to indicate that a project knows about another piece of functionality.

All the classes you ve added are static classes, which are composed exclusively of static members. Note that some understanding of basic OOP terminology such as classes, objects, constructors, methods, properties, fields, instance members and static members, public data and private data, and so on is an important prerequisite for this book. These topics are covered in many articles on the Internet, such as the ones you can find for free download at http://www.cristiandarie.ro/downloads.html.

Note The project only knows about the functionality that has been declared as being public. Public functionality, or what C# programmers call public scope, is when you declare a type with the public keyword. You will learn about public and other scopes throughout this book.

Note As opposed to instance class members, which always belong to a class instance (an object, that is),

To make Example2 aware of the functionality in Class1, you need to set a physical reference, as follows: 1. Click and expand the References node under Example2. Notice that three references already exist. When you typed Console.WriteLine() in Class1.cs, you were using functionality from the System reference. 2. Right-click References and select Add Reference. 3. Click the Projects tab. 4. Select Example3, and then click OK. Example3 will be added to Example2 s references. Once the reference has been assigned, Example2 can call the functionality in Example3.

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