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Therefore, when using an MMC console you re likely to encounter a User Account Control request for permission to continue. If UAC is enabled on your computer, the type of request you get and the restrictions that are imposed depend on what type of account is currently logged on.

If the class is abstract, the compiler-produced default constructor has protected accessibility; otherwise, the constructor is given public accessibility . If the base class doesn t offer a parameterless constructor, the derived class must explicitly call a base class constructor or the compiler will issue an error . If the class is static (sealed and abstract), the compiler will not emit a default constructor at all into the class definition . A type can define several instance constructors . Each constructor must have a different signature, and each can have different accessibility . For verifiable code, a class s instance constructor must call its base class s constructor before accessing any of the inherited fields of the base class . The C# compiler will generate a call to the default base class s constructor automatically if the derived class s constructor does not explicitly invoke one of the base class s constructors . Ultimately, System.Object s public, parameterless constructor gets called . This constructor does nothing it simply returns . This is because System.Object defines no instance data fields, and therefore its constructor has nothing to do . In a few situations, an instance of a type can be created without an instance constructor being called . In particular, calling Object s MemberwiseClone method allocates memory, initializes the object s overhead fields, and then copies the source object s bytes to the new object . Also, a constructor is usually not called when deserializing an object with the runtime serializer . The deserialization code allocates memory for the object without calling a constructor using the System.Runtime.Serialization.FormatterServices type's GetUninitializedObject or GetSafeUninitializedObject methods (as discussed in 24, Runtime Serialization ) . Important You should not call any virtual methods within a constructor that can affect the

Objective 2.2: Manage DNS 14-17

TABLE 2-2

Destination: 172.16.0.0 Network Mask: 255.240.0.0 Metric: 1

Second, when you allocate strings dynamically, initialize them to 0 by using calloc() instead of malloc(). calloc() allocates memory and initializes it to 0. malloc() allocates memory without initializing it so you get potluck when you use memory allocated by malloc().

See the Code Samples section in the Introduction for important information on running the examples for this chapter .

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In a packet filtering implementation designed for locked-down security, four filters are created for access to each service. As shown in Figure 9-40, one packet filter in this scenario is designed to match each of the four steps required for communication.

"@"="MyApp"

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Unordered Covering Nonclustered Index Scan + Lookups 2,855

CREATE UNIQUE INDEX idx_unc_mgrid_empid ON dbo.Employees(mgrid, empid);

<HyperlinkButton NavigateUri="http://www.microsoft.com" TargetName="_blank" Click="HyperlinkButton_Click"> <HyperlinkButton.Content> <Image Source="sl.jpg"/> </HyperlinkButton.Content> </HyperlinkButton>

8

SELECT C.custid, C.custname, O.orderid, O.empid, O.shipperid, O.orderdate FROM dbo.Customers AS C JOIN dbo.Orders AS O ON O.custid = C.custid WHERE C.custname LIKE 'Cust[_]1000%' AND O.orderdate >= '20080101' AND O.orderdate < '20080401';

When viewed holistically, the Java and .NET platforms are comparable: both provide solutions to most contemporary business computing issues. However, when the platforms are broken down into functional components, mapping between the constituent parts is often very loose. The .NET class library doesn't yet encompass all the functionality found in the J2EE class libraries and often needs to utilize other Microsoft technologies to provide a complete solution; we expect that these technologies will become more tightly integrated as the .NET platform matures. Despite these inconsistencies, we proceed with a liberal attitude, presenting technology alternatives that are accessible from the .NET platform even though they are not explicitly part of it.

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You're also allowed to group by the result of an expressionfor instance, GROUP BY YEAR(orderdate). If you do, when working in SQL Server 2000, all following steps cannot perform any further manipulation to the GROUP BY expression, unless it's a base column. For example, the following is not allowed in SQL Server 2000: SELECT YEAR(orderdate) + 1 AS nextyear ... GROUP BY YEAR(orderdate). In SQL Server 2005, this limitation has been removed.