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DateTime time = new DateTime(2001, 12, 24, 13, 14, 15, 16); Console.WriteLine(time.ToString("d")); Console.WriteLine(time.ToShortDateString()); Console.WriteLine(time.ToString("D")); Console.WriteLine(time.ToLongDateString());

This produces:

The .NET Framework provides more than just a class library. It also provides services in subtler ways that are not accessed explicitly through library calls. For example, earlier we mentioned that C# can automate some aspects of memory management, a notorious source of bugs in C++ code. Abandoning heap-allocated objects once you re done with them is a coding error in C++, but it s the normal way to free them in .NET. This service is provided by the CLR the .NET Framework s runtime environment. Although the C# compiler works closely with the runtime to make this possible, providing the necessary information about how your code uses objects and data, it s ultimately the runtime that does the work of garbage collection. Depending on what sorts of languages you may have worked with before, the idea that the language depends heavily on the runtime might seem either completely natural or somewhat disconcerting. It s certainly different from how C and C++ work with those languages, the compiler s output can be executed directly by the computer, and although those languages have some runtime services, it s possible to write code that can run without them. But C# code cannot even execute without the help of the runtime. Code that depends entirely on the runtime is called managed code. Managed compilers do not produce raw executable code. Instead, they produce an intermediate form of code called IL, the Intermediate Language. The runtime decides exactly how to convert it into something executable. One practical upshot of managed code is that a compiled C# program can run on both 32-bit and 64-bit systems without modification, and can even run on different processor architectures it s often possible

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* VB.NET supports XML literals. Since C# 2.0 shipped, the C# and VB.NET teams have operated a policy of keeping the feature sets of the two languages similar, so the fact that VB.NET picked up a feature that C# abandoned shows a clear difference in language philosophy. Depending on whether you read Microsoft s documentation, or the ECMA CLI (Common Language Infrastructure) specifications that define the standardized parts of .NET and C#, IL s proper name is either MSIL (Microsoft IL) or CIL (Common IL), respectively. The unofficial name, IL, seems more popular in practice.

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for code that runs on an ARM-based handheld device to run unmodified on Intel-based PCs, or on the PowerPC architecture found in the Xbox 360 game console As interesting as CPU independence may be, in practice the most useful aspect of managed code and IL is that the NET runtime can provide useful services that are very hard for traditional compilation systems to implement well In other words, the point is to make developers more productive The memory management mentioned earlier is just one example.

Listing 7-11 shows a portion of the code of the .__formatResponseDataRSSItem function that parses the XML returned by the environment.getXml(url) call. Here, each part of the XML is searched and placed in a local variable. In this case, itemNode. getElementsByTagName is used to see if the title tag has anything in it and assign its value to the title variable. This code is used for all 14 variables that make up an RSS post.

Others include a security model that takes the origin of code into account rather than merely the identity of the user who happens to be running the code; flexible mechanisms for loading shared components with robust support for servicing and versioning; runtime code optimization based on how the code is being used in practice rather than how the compiler guesses it might be used; and as already mentioned, the CLR s ability to verify that code conforms to type safety rules before executing it, ruling out whole classes of security and stability bugs If you re a Java developer, all of this will sound rather familiar just substitute bytecode for IL and the story is very similar Indeed, a popular but somewhat ignorant joke among the less thoughtful members of the Java community is to describe C# as a poor imitation of Java.

When the first version of C# appeared, the differences were subtle, but the fact that Java went on to copy several features from C# illustrates that C# was always more than a mere clone The languages have grown more obviously different with each new version, but one difference, present from the start, is particularly important for Windows developers: C# has always made it easy to get at the features of the underlying Windows platform..

A field is a place to put some data of a particular type. There s no option to add code like you can in a property a field is nothing more than data. Back before C# 3.0 the compiler didn t let us write just get; and set; we always had to write properties with code as in Example 3-9, and if we wanted a simple property that stored a value, we had to provide a field, with code such as Example 3-12.

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