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When creating an object, you need to specify the new keyword. The new keyword instantiates the object, which means it grabs on to a piece of memory and creates the object there. If you declare a variable for your object but you don t use the new keyword to actually instantiate it, you ll receive the infamous null reference error when you try to use your object. That s because the object you re attempting to use doesn t actually exist, and your variable doesn t point to anything at all. The following code snippet creates an object based on the Product class and then releases it: Product saleProduct = new Product(); // Optionally you could do this in two steps: // Product saleProduct; // saleProduct = new Product(); // Now release the object from memory. saleProduct = null; In .NET, you almost never need to use the last line, which releases the object. That s because objects are automatically released when the appropriate variable goes out of scope. Objects are also released when your application ends. In an ASP .NET web page, your application is given only a few seconds to live. Once the web page is rendered to HTML, the application ends, and all objects are automatically released.

This will create a file called average_price_report.pdf. If you open it, you should see something similar to Figure 6-2.

s Just because an object is released doesn t mean the memory it uses is immediately reclaimed. The Tip

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Prototype is a fantastic framework, but Thomas Fuchs has taken it further with the script.aculo.us (http://script.aculo.us) library. Script.aculo.us supplies a number of rich interface effects that are compatible across a number of modern browsers, coming prepackaged with visual effects, drag-and-drop, and the Ajax stalwart autocomplete text fields. Getting started with script.aculo.us couldn t be easier. Go to the download page (http://script.aculo.us/downloads), grab the latest version in your preferred archive, and drop prototype.js, scriptaculous.js, builder.js, effects.js, dragdrop.js, slider.js, and controls.js into the your favorite folder for script files in your application. Keep in mind that script.aculo.us builds upon Prototype, so make sure that you have the proper version of that installed as well. (Expect to see it bundled, but if it s not, the readme file should tell you what version you need.)

CLR uses a long-running service (called garbage collection) that periodically scans for released objects and reclaims the memory they hold.

In Listing 6-2, the script first parses the arguments from the command line, which is fairly straightforward. After that, you define a class that can be used to get the average price of certain combinations of keywords and sellers:

In some cases, you will want to declare an object variable without using the new keyword to create it. For example, you might want to assign an instance that already exists to your object variable. Or you might receive a live object as a return value from a function. The following code shows one such example:

// Declare but don't create the product. Product saleProduct; // Call a function that accepts a numeric product ID parameter, // and returns a product object. saleProduct = FetchProduct(23); Once you understand the concept, you can compress this code into one statement: Product saleProduct = FetchProduct(23); In these cases, when you aren t actually creating an object, you shouldn t use the new keyword.

class EBaySearch @@ebay_config = { :ebay_address=> 'rest.api.ebay.com', :request_token => 'my_request_token', :user_id => 'my_ebay_user_id' }.freeze

The simple Product class is essentially useless because your code cannot manipulate it All its information is private and unreachable Other classes won t be able to set or read this information To overcome this limitation, you could make the member variables public Unfortunately, that approach could lead to problems because it would give other objects free access to change everything, even allowing them to apply invalid or inconsistent data Instead, you need to add a control panel through which your code can manipulate Product objects in a safe way You do this by adding property accessors Accessors usually have two parts The get accessor allows your code to retrieve data from the object The set accessor allows your code to set the object s data.

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