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for ( int i = 1; i < 101; i++ )
     Console.WriteLine(

          i % 3 != 0 && i % 5 != 0 ? i.ToString() :
          i % 3 == 0 ? i % 5 == 0 ? "FizzBuzz" : "Fizz" : "Buzz"

     );

Console.ReadKey();

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for ( int i = 1; i < 101; i++ )
     Console.WriteLine(

          i % 3 != 0 && i % 5 != 0 ? i.ToString() :
          (i % 3 == 0 ? "Fizz" : "")+(i % 3 == 0 ? "Bizz" : "")

     );

Console.ReadKey();

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int mod15 = 0;

for ( int i = 1; i < 101; i++ ) {
     
     switch(++mod15) {
         case 15:
             Console.WriteLine("FizzBuzz");
             mod15 = 0;
             break;
         case 3:
         case 6:
         case 9:
             Console.WriteLine("Fizz");
             break;
         case 5:
         case 10:
             Console.WriteLine("Buzz");
             break;
         default:
             Console.WriteLine(i);
             break;

     }  

}

Console.ReadKey();

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(from n in Enumerable.Range(1, 100)
where (n % 3) == 1 || (n % 2) == 1
select n.ToString() + "=" + (((n % 2) == 1) ? "Fizz" : "") + (((n % 3) == 1) ? "Buzz" : "")).ToList().ForEach(Console.WriteLine);

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static string fizz(int i)
{
	if (i % 3 == 0)
		return "Fizz";
		
	return string.Empty;
}

static string Buzz(int i)
{
	if (i % 5 == 0)
		return "Buzz";
		
	return string.Empty;
}

for (int i = 1; i < 101; i++)
{
	string fizzbuzz = fizz(i) + Buzz(i);
	Console.WriteLine(fizzbuzz == string.Empty ? i.ToString() : fizzbuzz);
}

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public static class ExtensionMethods
{
    public static string FizzBuzz(this int i)
    {
        return (i % 3 == 0 && i % 5 == 0) ? "FizzBuzz" : (i % 3 == 0) ? "Fizz" : (i % 5 == 0) ? "Buzz" : i.ToString();
    }
}

class Program
{
    static void Main(string[] args)
    {
        for (int i = 1; i <= 100; i++) Console.WriteLine(i.FizzBuzz());
        Console.ReadLine();
    }
}

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String output; 
        for (int i=1;i<=100;i++)
        {
            output = (i % 3 == 0) ? "Fizz" : ""; 
            output = (i % 5 == 0) ? output + "Buzz" : output; 
            if (output.Equals("")) output = i.ToString();
            Response.Write(output + "<br />"); 
        }

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    static class ExtensionsMethods
    {
        public static bool IsMultipleOf(this int number, int num)
        {
            return number % num == 0;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            for (int i = 1; i <= 100; i++)
                Console.WriteLine(FizzBuzzify(i));

            Console.ReadKey();
        }

        static string FizzBuzzify(int i)
        {
            if (i.IsMultipleOf(3) && i.IsMultipleOf(5))
                return "FizzBuzz";

            if (i.IsMultipleOf(3))
                return "Fizz";

            if (i.IsMultipleOf(5))
                return "Buzz";

            return i.ToString();
        }
    }

FizzBuzz in Perl

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my %fbmap = (3 => 'Fizz', 5 => 'Buzz');
my $fizzbuzz = sub {
    my $num = $_;
    join('', map {$num % $_ ? '' : $fbmap{$_}} keys %fbmap) || $num;
};

print "@{[map &$fizzbuzz, 1..100]}\n";

FizzBuzzLogic.cs

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        /// <summary>
        /// Creates the transform.
        /// </summary>
        /// <returns>The Transform to apply to each number. This is really the FizzBuzz Operation.</returns>
        public ITransformer CreateTransformer()
        {
            return new CoalescingTransformer(
                        new ConcatenatingTransformer(
                            new PredicatedTransformer(
                                delegate(int i) { return i % 3 == 0; },
                                new StaticMessageTransformer("Fizz"),
                                new NullTransformer()),
                            new PredicatedTransformer(
                                delegate(int i) { return i % 5 == 0; },
                                new StaticMessageTransformer("Buzz"),
                                new NullTransformer())),
                        new IdentityTransformer());
        }

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class P {
    static void Main() {
        for (int i = 0; i++ < 100; )
            System.Console.WriteLine(
                i % 3 < 1 ? i % 5 < 1 ? "FizzBuzz" : "Fizz" :
                    i % 5 < 1 ? "Buzz" : "" + i
            );
    }
}