winforms data matrix

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Rather than expose the data member publicly, we will change the test code to use properties. Properties also expose the internal state of an object, but they provide a layer of abstraction. As you will learn, some properties expose both internal state and external state. This is the case with the ExchangeRate property that we will use to access and modify the exchange rate. If we did not use the ExchangeRate property, we would need to create a method that assigns the exchange rate and a method that retrieves the exchange rate. The methods would behave like the property, but they are not as convenient to use.

Note Although SQL is not case sensitive, in this book the SQL commands and queries appear in uppercase

The interesting thing about C# properties is that they look and behave like data members. This means with C# properties, the test code does not need to be rewritten, as the test code still assumes a direct access to the variable. Consider the rewritten CurrencyTrader that exposes ExchangeRate as a C# property, shown in Figure 6-3.

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The simplest SELECT command you can execute on your BalloonShop database is SELECT * FROM Department If you ve created and populated the Department table as described in the exercises, you should get the results shown in Figure 4-12. The * wildcard you used in the SQL query means all columns. Most of the time, unless you have a serious reason to use it, it s good to avoid using this wildcard, instead specifying the columns you want returned manually, like this: SELECT DepartmentID, Name, Description FROM Department

For the algebraic equation math problem, look at the Math Problem 3 section toward the bottom of the worksheet, as shown in Figure 1-8.

Figure 6-3. Exposing ExchangeRate as a C# property To completely fool the test, the name of the property must be identical to the name of the previously declared data member. So that there is no identifier collision, the data member ExchangeRate is renamed to _exchangeRate and the scope changes from public to private. Properties look like methods without parameters, but have a return value. Also, each property must have at least a get code block or a set block (it can have both), which are called getters and setters. If a property has only a get code block, you have created a read-only property. If a property has only a set code block, you have created a set-it-and-forget-it property. Within the context of a property, you can have only the get or set keyword. You cannot add any other code.

Figure 4-12. Executing a simple SQL command using SQL Server Management Studio The following command returns the name of the department that has the DepartmentID of 1. In your case, the returned value is "Anniversary Balloons", but you would receive no results if there were no departments with an ID of 1. SELECT Name FROM Department WHERE DepartmentID = 1

The following code will execute the code defined in the get code block and retrieve the state from the class to the variable. value = cls.ExchangeRate; And the following code will execute the code in the set code block and assign the state from the variable to the class. cls.Exchange = value; Each code block has special features. The get code block must always return data to the caller and thus requires use of the return keyword. The set code block has no requirements to do anything. However, if you want to know what data is being passed to the property, you can use the value variable, which is not declared in your code, but is instead implied. Consider this as a situation where the magic variable value is made available to you by the C# programming language.

The INSERT statement is used to insert or add a row of data into the table. Its syntax is as follows: INSERT [INTO] <table name> (column list) VALUES (column values) The following INSERT statement adds a department named Mysterious Department to the Department table: INSERT INTO Department (Name) VALUES ('Mysterious Department')

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