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The newobj IL instruction constructs a new instance of an object . However, no newobj instruction appears in the IL code example . Instead, you see the special ldstr (load string) IL instruction, which constructs a String object by using a literal string obtained from metadata . This shows you that the common language runtime (CLR) does, in fact, have a special way of constructing literal String objects . If you are using unsafe code, you can construct a String object from a Char* or SByte* . To accomplish this, you would use C# s new operator and call one of the constructors provided by the String type that takes Char* or SByte* parameters . These constructors create a String object, initializing the string from an array of Char instances or signed bytes . The other constructors don t have any pointer parameters and can be called using safe (verifiable) code written in any managed programming language .

DHCP: Hops (hops) = 0 (0x0)

DHCP: Transaction ID (xid) = 556223005 (0x21274A1D)

private void incrementCounter() { lock (this) { o_counter++; } }

C# offers some special syntax to help you enter literal strings into the source code . For special characters such as new lines, carriage returns, and backspaces, C# uses the escape mechanism familiar to C/C++ developers:

DHCP: Seconds (secs) = 0 (0x0)

// String containing carriage-return and newline characters String s = "Hi\r\nthere.";

DHCP: Flags (flags) = 0 (0x0)

This fragment can be rewritten to use Interlocked as follows:

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into the string, I don t recommend this practice . Instead, the System.Environment type defines a read-only NewLine property that returns a string consisting of these characters when your application is running on Microsoft Windows . However, the NewLine property is platform sensitive, and it returns the appropriate string required to obtain a newline by the underlying platform . So, for example, if the Common Language Infrastructure (CLI) is ported to a UNIX system, the NewLine property would return a string consisting of just a single character \n . Here s the proper way to define the previous string so that it works correctly on any platform:

DHCP: 0............... = No Broadcast DHCP: Client IP Address (ciaddr) = 0.0.0.0 DHCP: Your IP Address (yiaddr) = 10.54.50.5 DHCP: Server IP Address (siaddr) = 0.0.0.0 DHCP: Relay IP Address (giaddr) = 0.0.0.0 DHCP: Client Ethernet Address (chaddr) = 08002B2ED85E DHCP: Server Host Name (sname) = <Blank> DHCP: Boot File Name (file) = <Blank> DHCP: Magic Cookie = [OK] DHCP: Option Field (options) DHCP: DHCP Message Type = DHCP ACK

DHCP: Renewal Time Value (T1) = 8 Days, 0:00:00

String s = "Hi" + Environment.NewLine + "there.";

private void incrementCounter() { Interlocked.Increment(ref o_counter); }

DHCP: Rebinding Time Value (T2) = 14 Days, 0:00:00

You can concatenate several strings to form a single string by using C# s + operator as follows:

DHCP: IP Address Lease Time = 16 Days, 0:00:00

// Three literal strings concatenated to form a single literal string String s = "Hi" + " " + "there.";

DHCP: NetBIOS Node Type = (Length: 1) 04

Extensive commonality exists in the syntax and functionality of statements in C# and Java:

DHCP NACK DHCP NACK messages are most often used when the client computer has been moved to a new location. However, the message can also indicate that the cli ent s lease with the server has expired. The following capture provides an example.

In this code, because all of the strings are literal strings, the C# compiler concatenates them at compile time and ends up placing just one string "Hi there." in the module s metadata . Using the + operator on nonliteral strings causes the concatenation to be performed at runtime . To concatenate several strings together at runtime, avoid using the + operator because it creates multiple string objects on the garbage-collected heap . Instead, use the System.Text.StringBuilder type (which I ll explain later in this chapter) . Finally, C# also offers a special way to declare a string in which all characters between quotes are considered part of the string . These special declarations are called verbatim strings and are typically used when specifying the path of a file or directory or when working with regular expressions . Here is some code showing how to declare the same string with and without using the verbatim string character (@) .

IP: ID IP: IP: IP: = 0x3F1A; Proto = UDP; Len: 328 Version = 4 (0x4) Header Length = 20 (0x14) Service Type = 0 (0x0) IP: Precedence = Routine

// Specifying the pathname of an application String file = "C:\\Windows\\System32\\Notepad.exe"; // Specifying the pathname of an application by using a verbatim string String file = @"C:\Windows\System32\Notepad.exe";

All statements must end with a semicolon. Block statements are formed using braces. An empty statement is represented by a single semicolon. In both languages, it's considered a good idea to comment the existence of any empty statement.

Total Length = 328 (0x148)