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Louvered (or jalousie) windows are the most vulnerable type of window Jalousie windows are made of a ladder-like configuration of narrow, overlapping slats of glass that can easily be pulled out of the thin metal channels Jalousies attract the attention of burglars and should be replaced with another type of window The type of window used in most homes is the double-hung window, which consists of two square or rectangular sashes that slide up and down, and are secured with a metal thumb-turn butterfly sash lock (although most manufacturers call it a lock, the device is really a clamp) The device holds the sashes together in the closed position, but a burglar can work it open by shoving a knife in the crack between the frames Several companies make a useful replacement for conventional sash locks The devices can t be opened from outside a building They look like a standard sash lock, but they incorporate a springloaded lever that prevents them from being manipulated out of the lock position by using a knife between the sashes As an alternative to replacing sash locks, a ventilating wood window lock can be installed This device lets someone inside raise the window a few inches, and then sets the bolt, which prevents anyone from outside from raising it higher A ventilating wood window lock consists of an L-shaped metal bolt assembly and a small metal base The bolt assembly fits along the inner edge of either of the two stiles (vertical members) of the top sash and is held in place with two small screws The bolt assembly has a horizontal channel that lets you slide the bolt into the locked and unlocked position When in the locked position, the bolt is parallel to the window and out of the way of the bottom sash The higher you place the bolt mechanism above the bottom sash, the higher you ll be able to raise the window with the bolt in the locked position The base isn t really needed, but it helps to prevent the bottom sash from getting marred Many companies make ventilating wood window locks, and there aren t important differences between brands Most models are sold at locksmith shops and home improvement centers for less than $10 each.

Summary

In this chapter, we have dealt with a number of exam topics Make sure that you feel comfortable with configuring a Windows application and setting security both role-based and code-access security You should also know the techniques for optimizing the performance of a Windows application, paying close attention to precompiling as a valuable technique for saving system resources You may find a little on the exam regarding user assistance in the form of ToolTips, help menu items, and context-sensitive help Also spend some time on localizing a Windows Form, as you will need to know the classes that retrieve system information from the local computer and determine the locale of the application s runtime This completes the fourth part of this book the Windows exam By now you should be experienced at creating Windows applications and working with the code that accompanies the graphical interface Prepare yourself for the exam by going through the questions at the end of each chapter, and then take the practice test on the accompanying CD That should prepare you for the exam Of course, there s nothing like experience so work with C# as much as you can

Glazing is a term that refers to any transparent or translucent material usually some kind of glass or plastic used on windows or doors to let in light Most types of windows can be made more secure by replacing the glazing with more break-resistant material The most common glazing for small windows is standard sheet glass Plate glass which is a little stronger is generally used in large picture windows Because plate glass also has the problem of breaking into many dangerous piece, it shouldn t be used in exterior doors Tempered glass is several times stronger than plate glass and costs about twice as much Rather than shattering into many pieces, tempered glass breaks into small harmless pieces, which is the reason for using it in patio doors When a large piece of tempered glass breaks, it makes a lot of noise, and this may attract the attention of neighbors The strongest type of glass a homeowner might use is laminated glass Laminated glass is made of two or more sheets of glass with a plastic inner layer sandwiched between them The more layers of glass and plastic, the stronger (and the more costly) the laminated glass is Laminated glass 4 inches thick can stop bullets and is often used for commercial applications Plastics are commonly used as glazing materials Acrylics, such as Plexiglas and Lucite, are very popular because they are clearer and stronger than sheet glass However, they scratch easily and can be sawed through The strongest types of plastic a homeowner might use are polycarbonates, such as Lexigard and Lexan Although they re not as clear as acrylics, polycarbonates are up to 30 times stronger Untreated polycarbonates scratch easily, but you can buy sheets with scratch-resistant coatings

public Heja(int Counter) { instanceNumber = Counter; SystemConsoleWriteLine("Instance number {0} created", instanceNumber); } ~Heja() { // use the destructor to make the Finalize() method execute, this is // enforced by the Framework // Perform some cleanup operations here SystemConsoleWriteLine("Finalizing object {0}", instanceNumber); } }

What you see in this example is the definition of a class with a constructor (code that will run when the object is created on the stack) and a declared destructor (code that will run when the object is garbage collected) The C# compiler will actually convert the declared destructor to a call to the Finalize() method The Finalize() method is called recursively for all of the instances in the inheritance chain, from the most derived to the least derived