Beginning VB 2008 : from novice to professional by Christian Gross

By Christian Gross

The VB 2008 language is your gateway to the strong .NET platform. VB mixed with visible Studio can provide the liberty to create your purposes quicker and with a better variety of instruments than the other coding surroundings. during this booklet, writer Christian Gross will stroll you thru every little thing you must understand on the way to suppose at domestic within the VB 2008 coding atmosphere. You’ll commence developing actual purposes within the first few pages of starting VB 2008 and come upon solid layout and trying out behavior in each bankruptcy. You’ll not just examine the language, but in addition have fun with the mind-set of an entire developer as you move in the course of the book.

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Remember to add a reference to the Calculator class library (right-click TestCalculator and choose Add Reference ➤ Projects ➤ Calculator). Remember to set TestCalculator as the startup project for debugging purposes. Figure 2-10 shows the TestCalculator and Calculator projects in the Solution Explorer. N ET NUMBER AND VA LUE T YPES Figure 2-10. NE T N UMBER A ND VA LUE TYPES Press Ctrl+F5 to test the calculation. When executed, the testing console application calls the test method TestSimpleAddition(), which calls and verifies the functionality of the Calculator class library.

The idea is that each level is responsible for certain functionality, and other levels do not duplicate efforts by reimplementing certain functionality. The higherlevel functionality does have a lower-level dependency, but the lower level does not have a higher-level dependency. NE T N UMBER A ND VA LUE TYPES Figure 2-5. Arrangement of calculator pieces Applications are realized using either top-down or bottom-up architecture. A top-down methodology means creating the higher-level components and then implementing the lowerlevel components when needed.

You need a machine that calls a server to verify that your piece of plastic has enough money to pay for the item. Paying with cash is much faster than paying with a credit card, because you don’t need to talk to a remote computer. Now suppose you and your spouse want to pay for the item. You could use the same credit card account, but you have unique credit cards. But you cannot do the same thing with cash. If you have a $10 bill, your spouse cannot share the $10 with you. Your spouse would need a second $10 bill, and together you would have $20.

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