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You could use either one of the preceding code lines in a program because they produce identical strings in the assembly s metadata . However, the @ symbol before the string on the second line tells the compiler that the string is a verbatim string . In effect, this tells the compiler to treat backslash characters as backslash characters instead of escape characters, making the path much more readable in your source code . Now that you ve seen how to construct a string, let s talk about some of the operations you can perform on String objects .

Identification = 16154 (0x3F1A)

Labeled statements are implemented by C# and Java in the same way, differing only in how jumps are performed. In Java, jumps are made to a labeled statement using the continue or break statement, as shown in the following example:

Flags Summary = 0 (0x0)

The most important thing to know about a String object is that it is immutable . That is, once created, a string can never get longer, get shorter, or have any of its characters changed . Having immutable strings offers several benefits . First, it allows you to perform operations on a string without actually changing the string:

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IP: .......0 = Last fragment in datagram IP: ......0. = May fragment datagram if necessary Fragment Offset = 0 (0x0) bytes Time to Live = 128 (0x80) Protocol = UDP - User Datagram Checksum = 0x2CBE Source Address = 10.54.48.151 Destination Address = 255.255.255.255 Data: Number of data bytes remaining = 308 (0x0134) (xid=74A005CE) (op) = 2 (0x2)

if (s.ToUpperInvariant().Substring(10, 21).EndsWith("EXE")) { ... }

IP: IP: IP:

mylabel: // statements while (/* some condition */) { break mylabel; }

Here, ToUpperInvariant returns a new string; it doesn t modify the characters of the string s . Substring operates on the string returned by ToUpperInvariant and also returns a new string, which is then examined by EndsWith . The two temporary strings created by ToUpperInvariant and Substring are not referenced for long by the application code, and the garbage collector will reclaim their memory at the next collection . If you perform a lot of string manipulations, you end up creating a lot of String objects on the heap, which causes more frequent garbage collections, thus hurting your application s performance . To perform a lot of string manipulations efficiently, use the StringBuilder class . Having immutable strings also means that there are no thread synchronization issues when manipulating or accessing a string . In addition, it s possible for the CLR to share multiple identical String contents through a single String object . This can reduce the number of strings in the system thereby conserving memory usage and it is what string interning (discussed later in the chapter) is all about . For performance reasons, the String type is tightly integrated with the CLR . Specifically, the CLR knows the exact layout of the fields defined within the String type, and the CLR accesses these fields directly . This performance and direct access come at a small development cost: the String class is sealed, which means that you cannot use it as a base class for your own type . If you were able to define your own type, using String as a base type, you could add your own fields, which would break the CLR s assumptions . In addition, you could break some assumptions that the CLR team has made about String objects being immutable .

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Comparing is probably the most common operation performed on strings . There are two reasons to compare two strings with each other . We compare two strings to determine equality or to sort them (usually for presentation to a user) . In determining string equality or when comparing strings for sorting, it is highly recommended that you call one of these methods (defined by the String class):

8-13

In C#, the break and continue statements do not take targets. To jump to a labeled statement, use the goto statement:

DHCP: Hardware Address Length (hlen) = 6 (0x6)