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Some string operations

Some string operations
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
// Some string operations.  
using System;  
public class StrOps {   
  public static void Main() {   
    string str1 =  
      "When it comes to .NET programming, C# is #1.";   
    string str2 = string.Copy(str1);  
    string str3 = "C# strings are powerful.";   
    string strUp, strLow; 
    int result, idx;  
    Console.WriteLine("str1: " + str1); 
    Console.WriteLine("Length of str1: " +   
    // create upper- and lowercase versions of str1  
    strLow = str1.ToLower(); 
    strUp =  str1.ToUpper(); 
    Console.WriteLine("Lowercase version of str1:\n    " + 
    Console.WriteLine("Uppercase version of str1:\n    " + 
    // display str1, one char at a time.  
    Console.WriteLine("Display str1, one char at a time."); 
    for(int i=0; i < str1.Length; i++)  
    // compare strings 
    if(str1 == str2)   
      Console.WriteLine("str1 == str2");   
      Console.WriteLine("str1 != str2");   
    if(str1 == str3)   
      Console.WriteLine("str1 == str3");   
      Console.WriteLine("str1 != str3");   
    result = str1.CompareTo(str3);  
    if(result == 0)  
      Console.WriteLine("str1 and str3 are equal");  
    else if(result < 0)  
      Console.WriteLine("str1 is less than str3");  
      Console.WriteLine("str1 is greater than str3");  
    // assign a new string to str2  
    str2 = "One Two Three One";  
    // search string 
    idx = str2.IndexOf("One");  
    Console.WriteLine("Index of first occurrence of One: " + idx);  
    idx = str2.LastIndexOf("One");  
    Console.WriteLine("Index of last occurrence of One: " + idx);  


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16.Removing CharactersRemoving Characters
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32.Demonstrate escape sequences in strings. Demonstrate escape sequences in strings.
33.Demonstrate verbatim literal stringsDemonstrate verbatim literal strings
34.Display a string in reverse by using recursionDisplay a string in reverse by using recursion
35.Demonstrate Concat()Demonstrate Concat()
36.Demonstrate Concat() 2Demonstrate Concat() 2
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