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Thread affinity means that code which responds to user input has to run on the UI thread, so if you re keeping that thread busy, the UI will become unresponsive It s really annoying to use programs that stop responding to user input when they re working these applications seem to freeze anytime something takes too long, making them very frustrating to use Failing to respond to user input within 100 ms is enough to disrupt the user s concentration (And it gets worse if your program s user interface uses animation the occasional glitch of just 15 ms is enough to make a smooth animation turn into something disappointingly choppy) Threads offer one solution to this: if you do all your potentially slow work on threads that aren t responsible for handling user input, your application can remain responsive.

However, this can sometimes seem like an overcomplicated solution in a lot of cases,.

slow operations don t work synchronously under the covers Take fundamental operations such as reading and writing data from and to devices such as network cards or disks, for example The kernel-mode device drivers that manage disk and network I/O are instructed by the operating system to start doing some work, and the OS expects the driver to configure the hardware to perform the necessary work and then return control to the operating system almost immediately on the inside, Windows is built around the assumption that most slow work proceeds asynchronously, that there s no need for code to progress strictly in sync with the work This asynchronous model is not limited to the internals of Windows there are asynchronous public APIs.

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In general, you should not attempt to transform dangerous input characters to attempt to turn a potentially dangerous input string into a sanitized one. Nevertheless, some databases provide support for doing so. If you do use such functions, you are encouraged to do so very carefully! For instance, consider an example in which you transform a username with a quote in it to valid input by escaping it and storing it in the database. A new user who registers with your application may, for instance, choose o'connor as her username and terminator as her password. The code that the web application server executes to add this user to the database might be the following:5 sql = "INSERT INTO USERS(uname,passwd) " + "VALUES ('" + escape(uname)+ "','" + escape(password) +"')"; The escape() function in the preceding code substitutes dangerous character sequences with benign ones. In particular, the escape() function replaces a single quote ('), which signifies a change of context between data and control, to two single quotes (''), which the database interprets as a single quote of data. The resulting insert statement might look as follows: INSERT INTO USERS(uname,passwd) VALUES ('o''connor','terminator');

These typically return very quickly, long before the work in question is complete, and you then use either a notification mechanism or polling to discover when the work is finished The exact details vary from one API to another, but these basic principles are universal Many synchronous APIs really are just some code that starts an asynchronous operation and then makes the thread sleep until the operation completes An asynchronous API sounds like a pretty good fit for what we need to build responsive interactive applications# So it seems somewhat ludicrous to create multiple threads in order to use synchronous APIs without losing responsiveness, when those synchronous APIs are just wrappers on top of intrinsically asynchronous underpinnings Rather than creating new threads, we may as well just use asynchronous APIs directly where they are available, cutting out the middle man NET defines two common patterns for asynchronous operations.

There s a low-level pattern which is powerful and corresponds efficiently to how Windows does things under the covers And then there s a slightly higher-level pattern which is less flexible but considerably simpler to use in GUI code..

To resize the table and its rows and columns, double-click one of the cells. Figure 5-22 shows the table after the top row has been double-clicked. You can resize the table by clicking and dragging one of the editing squares on the table. Clicking the circle with the x will delete the entire table, if the circle appears on the top of the table. Otherwise, clicking it will delete the cell it is above. Clicking the arrow to the left or right of the circle

The Asynchronous Programming Model (APM) is a pattern that many asynchronous APIs in the .NET Framework conform to. It defines common mechanisms for discovering when work is complete, for collecting the results of completed work, and for reporting errors that occurred during the asynchronous operation. APIs that use the APM offer pairs of methods, starting with Begin and End. For example, the Socket class in the System.Net.Sockets namespace offers numerous instances of this pattern: BeginAccept and EndAccept, BeginSend and EndSend, BeginConnect and EndConnect, and so on.

#Asynchronous APIs tend to be used slightly differently in server-side code in web applications. There, they are most useful for when an application needs to communicate with multiple different external services to handle a single request.

5. In a real-world application, passwords would not be stored in the database in clear text. We discuss password storage in more detail in 9.

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