C# 0 The Complete Reference

string

 method called 

ToCharArray( )

, which 

returns an array containing the characters in the string. The result is assigned to a variable 

called

chrArray

, which is then used by a nested 

from

 clause to obtain the individual characters 

in the array. The query then sorts the characters and returns the resulting sequence.

// Use a let clause and a nested from clause.

using System;

using System.Linq;

class LetDemo {

  static void Main() {

    string[] strs = { "alpha", "beta", "gamma" };

    // Create a query that obtains the characters in the

    // strings, returned in sorted order. Notice the use

    // of a nested from clause.

    var chrs = from str in strs

               let chrArray = str.ToCharArray()

                  from ch in chrArray

                  orderby ch

                  select ch;

    Console.WriteLine("The individual characters in sorted order:");

    // Execute the query and display the results.

    foreach(char c in chrs) Console.Write(c + " ");

    Console.WriteLine();

  }

}

The output is shown here:

The individual characters in sorted order:

a a a a a b e g h l m m p t

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In the program, notice how the