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Figure 8-8. Creating a record browser Here s the code that sets up the data bindings: private void MultipleControlBinding_Load(object sender, EventArgs e) { // Get the data object. DataTable dt = Program.StoreDB.GetProducts(); // Use complex binding. cboModelName.DataSource = dt; cboModelName.DisplayMember = "ModelName"; // Use simple binding. lblModelNumber.DataBindings.Add("Text", dt, "ModelNumber"); lblUnitCost.DataBindings.Add("Text", dt, "UnitCost"); lblDescription.DataBindings.Add("Text", dt, "Description"); }

Note As you can see from this example, users can still introduce malicious code even when you don t expect them to pass in any input data. If your application passes any data internally, it is important to ensure that the receiving web pages validate and check any incoming data appropriately before usage.

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The nicest thing about single-value binding is that it can be used with almost any property. For example, you could set the background color of a text box, or specify the font. Unfortunately, there is no implicit type conversion when setting these specialized properties, which means you can t easily convert a string representing a font name into an actual font object. The example that follows (Figure 8-9) demonstrates some of the extra effort you need to make if you want to bind one of these properties, and it makes for an interesting example of extreme data binding. Two list boxes are bound to the Font and ForeColor properties of a Label control. As you select different items in the list, the label changes automatically.

Listing 15-5 The user Grant Table mysql> SELECT User, Host FROM mysqluser; +-----------+-------------------+ | User | Host | +-----------+-------------------+ | | % | | mkruck | % | | jpipes | %examplecom | | mkruck | adminexamplecom | | | localhost | | jpipes | localhost | | mkruck | localhost | | root | localhost | | responder | mailexamplecom | +-----------+-------------------+.

ne of the great advantages of rich client applications is their support for asynchronous operations in other words, their ability to perform multiple tasks at the same time and still remain responsive. The same feat isn t possible in a typical server-side Web application. Although Web browsers are themselves multithreaded pieces of software, most Web applications strictly separate the work that s done in the browser from the work that s done on the server, for both security and compatibility reasons. As a result, there s little (if any) support for background processing. Even if the server-side application uses multiple threads, the user is still stuck waiting until all the work is completed before the final HTML for the page is rendered, sent back, and displayed in the browser.1 In a Windows client application, running multithreaded code is as easy as instantiating an object and calling a method. However, multithreading safely isn t as clear-cut. Several issues can trip you up, including passing data from one thread to another, updating controls from the proper thread, and properly cleaning up when the work is finished. In this chapter, you ll learn about these techniques and consider several ways to implement multithreading. You ll look at a simple application that calculates prime numbers by brute force and see how to implement it with asynchronous delegate calls, the new BackgroundWorker component, and the Thread class.

The following are precautions that you can take to prevent nonpersistent XSS attacks: Always scramble or encrypt the query string portion of a URL. Always double-check input data. For example, if the product ID is a number, you should check if the incoming product ID is a numerical value. Whenever possible, place checks on a web page to ensure that the currently logged-on user has rights to view the desired page and its data. Input data that is eventually fed into an SQL statement should always be passed in as parameters.

When MySQL sorts this list according to specificity, it will be ordered by the most specific Host value to the least specific. Since IP addresses or domain names are more specific than a host specification that contains a wildcard, the actual order in which MySQL would see the entries in Listing 15-5 would be as listed in Table 15-6. Table 15-6. The user Table Results Ordered by Specificity of Username and Host Label

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