gistfile1.txt

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            // Count up from 1 to 100.
            for (int i = 1; i <= 100; i++)
            {
                // If a number is not a multiple of 3 or 5, print it.
                if (((i % 3) != 0) && ((i % 5) != 0))
                {
                    Console.Write(i);
                }
                else
                {
                    // If a number is a multiple of 3 print "Fizz"
                    if ((i % 3) == 0)
                    {
                        Console.Write("Fizz");
                    }
                    // If a number is a multiple of 5 print "Buzz"
                    if((i % 5) == 0)
                    {
                        Console.Write("Buzz");
                    }
                }
                // Print a new line between numbers.
                Console.WriteLine("");
            }
        }
    }
}

Nice catch on the syntax error. I didn't realize C# was different than C in evaluating integers as bool's. As far as meeting the fizzbuzz spec though, as far as I can tell it is correct. =/