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The Windows registry provides a centralized repository where the operating system and applications can store information. The registry is structured hierarchically, with the registry key being the base unit of organization. Registry keys can hold both typed data and subkeys. Given the changes implemented with .NET, including self-describing assemblies, configuration files, and isolated storage, the importance of the registry is diminished. However, the registry is still a useful service, and the .NET Framework provides direct access to it through a simple set of classes in the Microsoft.Win32 namespace.

Table 4-3

And now, we can rewrite the OnNewMail method as follows:

Description The name of the host or the DNS domain to which this resource record belongs. A 32-bit integer that represents, in seconds, the length of time that a DNS server or client should cache this entry before it is discarded. This field is optional, and if it is not specified, the client uses the minimum TTL in the SOA record. The field that defines the protocol family in use. For Windows DNS servers, the resource record is always of the class Internet, abbreviated IN. This field is optional and is not automatically generated. The field that identifies the type of resource record, such as A or SRV. The resource record data. It is a variable-length field that represents the infor mation being described by the resource record type. For example, in an A resource record, this is the 32-bit IP address that represents the host identified by the owner.

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protected virtual void OnNewMail(NewMailEventArgs e) { e.Raise(this, ref m_NewMail); }

Most resource records are represented as single-line text entries. If an entry is going to span more than one line, parentheses can encapsulate the information. In many imple mentations of DNS, only the SOA resource record can contain multiple lines. For readability, blank lines and comments ignored by the DNS server are often inserted in the zone files. Comments always start with a semicolon (;) and end with a carriage return.

Despite having a hierarchical structure, the registry doesn't derive from a single root key. Microsoft.Win32.Registry is a utility class that contains seven static read-only RegistryKey fields (discussed next); these fields represent the primary entry points into the registry.

In most programming scenarios, this silent overflow is undesirable and if not detected causes the application to behave in strange and unusual ways In some rare programming scenarios (such as calculating a hash value or a checksum), however, this overflow is not only acceptable but is also desired Different languages handle overflows in different ways C and C++ don t consider overflows to be an error and allow the value to wrap; the application continues running Microsoft Visual Basic, on the other hand, always considers overflows to be errors and throws an exception when it detects one The CLR offers IL instructions that allow the compiler to choose the desired behavior The CLR has an instruction called add that adds two values together The add instruction performs no overflow checking The CLR also has an instruction called addovf that also adds two values together However, add.

The most common resource records you need to create manually include the following:

Host (A) Alias (CNAME) Mail exchanger (MX) Pointer (PTR) Service location (SRV)

ovf throws a SystemOverflowException if an overflow occurs In addition to these two IL instructions for the add operation, the CLR also has similar IL instructions for subtraction (sub/subovf), multiplication (mul/mulovf), and data conversions (conv/convovf) C# allows the programmer to decide how overflows should be handled By default, overflow checking is turned off This means that the compiler generates IL code by using the versions of the add, subtract, multiply, and conversion instructions that don t include overflow checking As a result, the code runs faster but developers must be assured that overflows won t occur or that their code is designed to anticipate these overflows One way to get the C# compiler to control overflows is to use the /checked+ compiler switch This switch tells the compiler to generate code that has the overflow-checking versions of the add, subtract, multiply, and conversion IL instructions .

The registry classes don't support direct random access to named registry keys; entry points must be obtained through the Registry class. The members of Microsoft.Win32.RegistryKey are used to navigate to the required registry key. Table A-6 lists the seven static fields, indicates the area they map to in the registry, and summarizes the information contained in that area.