10 C# One Liners to Impress Your Friends

oneliners.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Xml.Linq;

class TenCSharpOneLiners
{
    static void Main()
    {
        Print("Multiple each item in a list by 2", Enumerable.Range(1, 10).Select(i => i * 2));
        Print("Sum a list of numbers", Enumerable.Range(1, 1000).Sum());

        var wordlist = new[] { "C#", "and stuff" };
        var tweet = "This is an example tweet talking about C# and stuff";
        Print("Verify if a word exists in string", wordlist.Any(word => tweet.IndexOf(word) > -1));
        Print("Show matched words in string", wordlist.Where(word => tweet.IndexOf(word) > -1));

        Print("Read in a File", File.ReadAllBytes("oneliners.exe").Length);

        Print("Happy Birthday", Enumerable.Range(1, 4).Select((i) => string.Format("Happy Birthday {0} ", i == 3 ? "dear NAME" : "to You")));

        var passed = new List<int>();
        var failed = new List<int>();

        (from bucket in new[] { passed, failed } from i in new[] { 49, 58, 76, 82, 88, 90 } select new { bucket, i }).ToList().ForEach((tuple) => tuple.bucket.AddRange(Enumerable.Repeat(tuple, 1).Where((tup) => (tup.bucket == passed && tup.i > 60) || (tup.bucket == failed && tup.i <= 60)).Select((tup) => tup.i)));
        Print("Filter list of numbers >60", (IEnumerable<int>)passed);
        Print("Filter list of numbers <=60", (IEnumerable<int>)failed);

        Print("Fetch and Parse an XML web service", XDocument.Load("http://search.twitter.com/search.atom?&q=scala"));

        Print("Find minimum in a list", Enumerable.Min(new[] { 14, 35, -7, 46, 98 }));
        Print("Find maximum in a list", Enumerable.Max(new[] { 14, 35, -7, 46, 98 }));

        Print("Parallel Processing", Enumerable.Range(1, 10).AsParallel().Select((i)=>i*2).AsEnumerable());

        Print("Sieve of Eratosthenes", "TODO");

        Print("Fizzbuzz", Enumerable.Range(1, 15).Select((i)=>i + (i%3==0?"fizz":"") + (i%5==0?"buzz":"")));
    }

    static void Print<T>(string desc, T scalar)
    {
        Console.WriteLine("\n" + desc);
        Print(scalar);
    }

    static void Print<T>(T scalar)
    {
        Console.WriteLine(scalar);
    }

    static void Print<T>(string desc, IEnumerable<T> seq)
    {
        Console.WriteLine("\n" + desc);

        foreach (var item in seq)
        {
            Print(item);
        }
    }
}

The minifier I used: CSharpMinifier