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Page one of the Washington Post on Sunday, August 28, 2005, carried an obituary for VHS, the beloved videotape format that bravely won the war against Betamax and charmed millions of Americans by allowing them to enjoy mindless Hollywood entertainment without leaving their homes Although 947 million American households still owned VCRs, and more than $3 billion had been spent on VHS rentals and purchases in 2004, revenue from DVD sales and rentals was more than eight times greater The unprecedented success of DVD was pushing VHS off store shelves, out of customer storage cabinets, and into oblivion The pendulum swayed back on September 27, when Microsoft finally officially announced that it would back HD DVD along with Intel In an interview with the Daily Princetonian, Bill Gates sniped at Blu-ray, saying, it s that the protection scheme on Blu is very anti-consumer, referring to the added locks and lack of commitment to managed copy, unlike the HD DVD camp Gates and many other Blu-ray detractors glossed over the crucial point that managed copy was a feature of AACS so it applied equally to both formats He followed that with a prognostication that this is the last physical format there will ever be Everything s going to be streamed directly or on a hard disk So, in this way, it s even unclear how much this one counts Once again, having Bill Gates as a cheerleader resulted in faint praise indeed In October, Paramount decided it would firmly straddle the fence and offer movies on both HD DVD and Blu-ray Disc Warner Bros also climbed out of the HD DVD camp onto the fence, announcing it would also release titles in both formats At the same time, HP suddenly and publicly called for changes to the Blu-ray format, strongly suggesting that it would defect to the HD DVD format if its demands were not met HP specifically requested two features that were already part of HD DVD mandatory managed copy (to allow disc owners to copy content from their discs onto PCs and portable devices) and iHD (the XML and ECMAScript-based advanced interactivity format that Microsoft and others had developed in the DVD Forum) HP s cover story was that it did not want customers to have to choose between dissimilar competing formats Conspiracy theories blossomed Microsoft was paying HP off or had threatened to shortchange HP s access to the Windows OS The BDA s response came from spokesman Andy Parsons on November 16, 2005, Mandatory managed copy will be part of the Blu-ray format, but while HP s request [for interactivity] is being considered, at this point in time, the Blu-ray group is still proceeding down the path of Java, he told Reuters HP decided this was not good enough, and on December 16 announced that it would support both HD DVD and Blu-ray This was good news for Toshiba, which two days earlier had said that design work on its first HD-DVD player was complete, with factories ready to produce the players, but that it was held up waiting for the final version of AACS Remember AACS The content protection system that was going to be done the year before It was not for lack of effort, since the group had been gathering regularly for over a year, with meetings often dragging late into the night, but they had been unable to reach consensus on items such as managed copy and requests to add BD+ into the mix.

cmbxPhotographer.DataSource = _album; cmbxPhotographer.DataMember = "Photographer";

will simply loop until the user types A If you feel uncomfortable putting the assignment inside the while conditional expression, remember that the equal sign is just an operator that evaluates to the value of the right-hand operand

Unlike for and while loops, which test the loop condition at the top of the loop, the do-while loop checks its condition at the bottom of the loop This means that a do-while loop always executes at least once The general form of the do-while loop is do { statement sequence } while(condition); Although the curly braces are not necessary when only one statement is present, they are usually used to improve readability and avoid confusion (to you, not the compiler) with the while This do-while loop will read numbers from the keyboard until it finds a number less than or equal to 100:

As you will see if you compile this change, all photographers assigned to the album are listed, even if they occur multiple times. Even so, this is a good example of how to populate a list quickly with values from a data source. To provide a more robust implementation, implement a GetPhotographers method in the PhotoAlbum class that returns an array of unique photographer strings in the album. This array can then be set as the DataSource for the combo box. Be careful here, as you will need to update this setting in the SaveChanges method to accommodate any changes made to the list.

do { scanf("%d", &num); } while(num > 100);

1-19

As already mentioned, when binding to a database, the IBindingList interface will ensure that the bound properties and the database object stay in sync. When either object is modified, the other is automatically updated. One issue that remains in our current application is the display of our image in the PictureBox control. We will address this topic next. 17.4.4 DISPLAYING THE IMAGE While our application is working quite well, there is the small matter of our PictureBox control. As a simple solution, we could modify the SizeMode property of our PictureBox control to use the StretchImage value. This would stretch our image to fit the window, but would not preserve the aspect ratio of our images. A better solution, as we know very well, is to scale the image to preserve the aspect ratio within the window. We can do this if we paint the image ourselves rather than provide a value for the Image property. The Paint event for the PictureBox control can be used to perform this painting, although we still need to know which image to paint. For this, we will use the Tag property to keep track of the current image. Of course, as we mentioned earlier in the book, it would be nice to build a PhotoBox control that did this automatically. Such a control would extend the Windows Forms PictureBox control to scale an image as we do in the subsequent table. Coding this by hand is not much extra work, so we did this explicitly here. A short discussion on how to build such a PhotoBox control is given at the end of section 18.2. The following steps are required to scale the image within the pboxPhoto control.

Perhaps the most common use of the do-while is in a menu selection function When the user enters a valid response, it is returned as the value of the function Invalid responses cause a reprompt The following code shows an improved version of the spelling-checker menu shown earlier in this chapter:

MODIFY THE PICTUREBOX CONTROL TO DISPLAY A SCALED IMAGE Action 1 In the OnLoad method of the MainForm.cs code window, replace the binding of the Image property in the pboxPhoto control to use the Tag property instead. Result