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C O R E   C #   P R O G R A M M I N G   C O N S T R U C T S, PA RT   I

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8849CH03.qxd  9/24/07  11:07 AM  Page 92

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However, if you are building an application that makes heavy use of textual data (such as a

word processing program), it would be a very bad idea to represent the word processing data using

string types, as you will most certainly (and often indirectly) end up making unnecessary copies of

string data. So what is a programmer to do? Glad you asked.

The System.Text.StringBuilder Type

Given that the string type can be inefficient when used with reckless abandon, the .NET base class

libraries provide the System.Text namespace. Within this (relatively small) namespace lives a class

named StringBuilder. Like the System.String class, StringBuilder defines methods that allow you

to replace or format segments and so forth. When you wish to use this type in your C# code files,

your first step is to import the correct namespace: