C# 0 The Complete Reference

orgstr

 is unchanged and 

substr

 contains the substring.

One more point: Although the immutability of 

string

 objects is not usually a restriction 

or hindrance, there may be times when it would be beneficial to modify a string. To allow 

this, C# offers a class called 

StringBuilder

, which is in the 

System.Text

 namespace. It 

creates string objects that can be changed. For most purposes, however, you will want to use 

string

, not 

StringBuilder

.

Strings Can Be Used in switch Statements

A

string

 can be used to control a 

switch

 statement. It is the only non-integer type that can 

be used in the 

switch

. The fact that strings can be used in 

switch

 statements makes it 

possible to handle some otherwise challenging situations more easily than you might 

expect. For example, the following program displays the digit equivalent of the words 

“one,” “two,” and “three”:

// A string can control a switch statement.

using System;

class StringSwitch {

  static void Main() {

    string[] strs = { "one", "two", "three", "two", "one" };

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