C# 0 The Complete Reference

The String Extension Methods

As mentioned earlier, 

String

 implements 

IEnumerable

. This means that beginning with 

C# 3.0, a 

String

 object can call the extension methods defined by 

Enumerable

and

Queryable

,

which are both in the 

System.Linq

 namespace. These extension methods primarily provide 

support for LINQ, but some can also be used for other purposes, such as certain types of 

string handling. See Chapter 19 for a discussion of extension methods.

Formatting

When a human-readable form of a built-in type, such as 

int

 or 

double

, is needed, a string 

representation must be created. Although C# automatically supplies a default format for this 

representation, it is also possible to specify a format of your own choosing. For example, as you 

saw in Part I, it is possible to output numeric data using a dollars and cents format. A number 

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