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You ll notice that you define type constructors just as you would parameterless instance constructors except that you must mark them as static Also, type constructors should always be private; C# makes them private for you automatically In fact, if you explicitly mark a type constructor as private (or anything else) in your source code, the C# compiler issues the following error: "error CS0515: SomeValTypeSomeValType() : access modifiers are not allowed on static constructors" Type constructors should be private to prevent any developer written code from calling them; the CLR is always capable of calling a type constructor In addition, the CLR exercises freedom as to when it decides to call the type constructor.

If you encounter a problem completing an exercise, you can find the completed projects in the samples installed from this book s companion CD. For more information about the project files and other content on the CD, see Using the Companion Media in this book s Introduction.

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The CLR calls a type constructor at either of the following times: Just before the first instance of the type is created or just before the first access to a noninherited field or member of the class is accessed This is called precise semantics because the CLR will call the type constructor at exactly the right time Sometime before the first access of a noninherited static field This is called before field init semantics because the CLR guarantees only that the static constructor will run sometime before the static field is accessed; it could run much earlier By default, compilers choose which of these semantics makes the most sense for the type you re defining and informs the CLR of this choice by setting the beforefieldinit metadata flag.

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The freachable queue gets it name because objects contained in the queue are considered to be reachable (and the f stands for finalization). The queue is a root, and objects referenced by the queue aren't garbage-collected; objects remain in the queue until the destructor is called, at which point they are removed from the queue and are available for garbage collection. There is a technique called resurrection, whereby a reference to an object is created from within the object's destructor, preventing it from being garbage-collected. Here's an example of how to resurrect an object:

Once executed, the type constructor will never be called again for the lifetime of that AppDomain (or process if the assembly is loaded in a domain neutral fashion) Because the CLR is responsible for calling type constructors, you should always avoid writing any code that requires type constructors to be called in a specific order The CLR guarantees only that a type constructor has started execution it can t guarantee that the type constructor has completed execution This behavior was necessary to avoid deadlocks in the unusual case when two type constructors reference each other..

Route To Initiate Demand-Dial Connections check box in the properties dia log box of the route is selected.

Note All the preceding assertions, including flunk, can take an optional message argument as the last

. 1 . . Open the ControlsORama project . Highlight the CustomControlLib project in Solution Explorer . Right-click the project node and click Add, New Item . Create an ASP .NET Server Control and name it PalindromeCheckerCompositeControl.cs . Use the ASP .NET Server Control template (as you did with the PalindromeCheckerRenderedControl in 4) . 2 . . After Visual Studio creates the code, do the following: a . . Edit the code to change the derivation from WebControl to CompositeControl . Deriving from the CompositeControl also adds the INamingContainer interface to the derivation list . (INamingContainer is useful to help ASP .NET manage unique IDs for the control s children .) b . . Add the PalindromeFound event that the host page can use to listen for palindrome detections (just as you did in the last chapter) . c . . Remove the RenderContents method . d . . Add four fields to the control a TextBox, a Button, a Label, and a LiteralControl . The code should look something like this when you re finished:

ALTER DATABASE testdb SET ALLOW_SNAPSHOT_ISOLATION ON;

groupid ---------a b c median ---------6.500000 5.000000 10.000000

The tabs correspond directly to the stages of the process you re likely to follow as you create a project in an application. For example, when you re creating a worksheet, you need commands related to data entry, editing, and formatting. Further on in the process, you might want to work with the information on the worksheet by sorting, filtering, consolidating, or validating it. These commands are available in the Data tab, further down the row in the Office Excel 2007 command tab display.

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