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In this case, the range values are passed using the indexer syntax, and the TypeMissing placeholder is not needed because this parameter now defaults Normally, when a method defines a ref parameter, you must pass a reference to that parameter However, when working with COM, you can pass a value to a ref parameter without having to first wrap it in an object This is because the compiler will automatically create a temporary argument for you that is already wrapped in an object, and ref is not needed in the argument list

But the only way that ln f ( x) can tend to zero is if f ( x) tends to 1 We conclude that lim ( 1 + x 2 ) ln |x| = 1

It is possible to make one assembly the friend of another A friend has access to the internal members of the assembly of which it is a friend This feature makes it possible to share members between selected assemblies without making those members public To declare a friend assembly, you must use the InternalsVisibleTo attribute

To conclude Part I, the few remaining keywords defined by C# that have not been described elsewhere are briefly discussed

The lock keyword is used when creating multithreaded programs It is examined in detail in 23, where multithreaded programming is discussed A brief description is given here for the sake of completeness In C#, a program can contain more than one thread of execution When this is the case, the program is said to be multithreaded, and pieces of the program are executed concurrently Thus, pieces of the program execute independently and simultaneously This raises the prospect of a special type of problem: What if two threads try to use a resource that can be used by

Hannah, a self-employed weaver, explained that she sends letters to specialty gift stores asking them to consider carrying her products I have a lot of trouble, Hannah says, nding new ways to say the same thing Here s how Hannah s most recent letter began:

YOU TRY IT Evaluate the limit limx 0+ ( 1/x) x YOU TRY IT Evaluate the limit limx 0+ ( 1 + x) 1/x In fact this limit gives an

20:

U n s a f e C o d e , P o i n t e r s , N u l l a b l e Ty p e s , D y n a m i c Ty p e s , a n d M i s c e l l a n e o u s To p i c s

only one thread at a time To solve this problem, you can create a critical code section that will be executed by one and only one thread at a time This is accomplished by lock Its general form is shown here: lock(obj) { // critical section } Here, obj is the object on which the lock is synchronized If one thread has already entered the critical section, then a second thread will wait until the first thread exits the critical section When the first thread leaves the critical section, the lock is released and the second thread can be granted the lock, at which point the second thread can execute the critical section

You can create a read-only field in a class by declaring it as readonly A readonly field can be given a value only by using an initializer when it is declared or by assigning it a value within a constructor Once the value has been set, it can t be changed outside the constructor Thus, a readonly field is a good way to create a fixed value that has its value set by a constructor For example, you might use a readonly field to represent an array dimension that is used frequently throughout a program Both static and non-static readonly fields are allowed

important way to define Euler's constant e (see Sections 19 and 623)

NOTE Although similar, readonly fields are not the same as const fields, which are described in the

following section Here is an example that creates a readonly field:

// Demonstrate readonly using System; class MyClass { public static readonly int SIZE = 10; } class DemoReadOnly { static void Main() { int[] source = new int[MyClassSIZE]; int[] target = new int[MyClassSIZE]; // Give source some values for(int i=0; i < MyClassSIZE; i++) source[i] = i; foreach(int i in source) ConsoleWrite(i + " "); ConsoleWriteLine();