This service enables you to combine PDF documents into a single one, free of charge. All you need to do is select the PDF documents that you want to merge together on your computer and click a button, as instructed step-by-step below. If you like our free service, please consider a donation.

Original link found at: http://news.ycombinator.com/

An event is a message sent by an object to signal the occurrence of an action. The action could be caused by user interaction, such as a mouse click, or it could be triggered by some other program logic. The object that raises the event is called the event sender. The object that captures the event and responds to it is called the event receiver. In event communication, the event sender class does not know which object or method will receive (handle) the events it raises. What is needed is an intermediary (or pointer-like mechanism) between the source and the receiver. The .NET Framework defines a special type (Delegate) that provides the functionality of a function pointer. A delegate is a class that can hold a reference to a method. Unlike other classes, a delegate class has a signature, and it can hold references only to methods that match its signature.

Boxing is the process of converting a value type to the type object or to any interface type implemented by this value type. When the CLR boxes a value type, it wraps the value inside a System.Object and stores it on the managed heap. Unboxing extracts the value type from the object. Boxing is implicit; unboxing is explicit. The concept of boxing and unboxing underlies the C# unified view of the type system, in which a value of any type can be treated as an object.

Inheritance, together with encapsulation and polymorphism, is one of the three primary characteristics (or pillars) of object-oriented programming. Inheritance enables you to create new classes that reuse, extend, and modify the behavior that is defined in other classes

Access modifiers are keywords added to the class, struct, or member declaration to specify these restrictions. Those keywords are public, private, protected, and internal.

We’re better connected than we’ve ever been, but we’re not always connected. For instance, I’m writing this on a train hurtling through the data-barren plains of West Sussex. Alternatively, you may choose to be offline. When I use data abroad I can almost hear the champagne corks popping in the offices of my network provider. I know I’m haemorrhaging money when I data-roam, but the internet has the data I need, and it won’t let me at most of it without a working connection.

Sprite Cow helps you get the background-position, width and height of sprites within a spritesheet as a nice bit of copyable css

There are many articles floating around the internet right now about defining RESTful API standards. I’m guessing this is because Ruby on Rails makes it so easy to build an API that everyone and their mom has started building one. These articles talk about the RFC on HTTP and how REST should fit in. They outline how current implementations are “broken” and want to come up with certain “standards” for governing how a RESTful API should work. These articles make all sorts of claims about how the return type of the data should only be set in the request headers, how the obscure “PATCH” HTTP method should be used, and how doing XYZ does not follow HATEOAS. The problem with these discussions is they propose solutions that are more academic than useful.

Fixie.js is an open source tool that automatically adds filler content to HTML documents.

Backbone.js gives structure to web applications by providing models with key-value binding and custom events, collections with a rich API of enumerable functions, views with declarative event handling, and connects it all to your existing API over a RESTful JSON interface.

A call tracking application allows you to collect metrics about your phone calls so you can monitor their effectiveness and optimize marketing. Using Twilio, you can record every call as well as track information such as what number was dialed, what time of day it was dialed, the duration of the call, and the geographic location of the caller.

Simple REST and HTTP API Client for .NET

Building off the basic IVR we created in the last sections, we can easily add features commonly found in sophisticated IVRs, such as call screening (often referred to as "whisper") and recording.

The best managers have a fundamentally different understanding of workplace, company, and team dynamics. See what they get right.

Cubism.js is a D3 plugin for visualizing time series. Use Cubism to construct better realtime dashboards, pulling data from Graphite, Cube and other sources. Cubism is available under the Apache License on GitHub.

The blog post is the first in a series of posts that attempts to outline what a modern web development toolchain looks like and how to use the best-of-breed tools for efficient, effective development.

That's a very big array to traverse, and some browsers just couldn't keep up. To overcome this, I pre-process the images when they are first loaded, and grab the pixels that reference colors which are animated (i.e. are part of cycling sets in the palette). Those pixel X/Y offsets are stored in a separate, smaller array, and thus only the pixels that change are refreshed onscreen. This optimization trick works so well, that the thing actually runs at a pretty decent speed on my iPhone 3GS and iPad!

Spinto took a lot of work to get into beta. Going public beta meant an opportunity to give the product some exposure. I don’t have a budget for marketing, or an already existing audience. I’m not Internet famous or any other kind of famous. Thank goodness :-)

Headquartered in St. Louis, Missouri, Joe's New Balance Outlet is operated by NB Web Express, LLC ("NB Web Express"). Our mission is to be the source for clearance merchandise from New Balance. We achieve this through our staff of experts and extensive inventory of New Balance footwear (in all sizes & widths), apparel and accessories.

Running faster, more efficiently, and injury free is what runners strive for, and having good running form is paramount to achieving these goals. Good Form Running aims to help runners of all ages and abilities; having proper mechanics is important for everyone. The simplicity of the technique, and the focus on body awareness, make Good Form Running both unique and effective. This video covers the basic steps of Good Form Running as presented by Playmakers running store in Okemos, Michigan. Please visit www.goodformrunning.com or Playmakers.com for more information.

Setup, manage and maintain an on site cutting edge versionning system.

Bonobo Git Server for Windows is a web application you can install on your IIS and easily manage and connect to your git repositories.

OK – let me start this post by saying this is absolutely NOT for the faint hearted. This was a serious – and I re-emphasize this – serious pain in the arse to the do.

As part of our Git server configuration, we’re using Gitosis manage multiple repositories with different authorization requirements using a single SSH account. I’m assuming you’ve read my previous post on Setting up a Git server with Windows Server 2008 and are ready to follow along as the steps assume you’ve already installed Cygwin with Git, OpenSSH and Python.

To configure an HTTPS server you must enable the SSL protocol in the server block, and specify the locations of the server certificate and private key files

The server that I've been using to host my other site, oc-technology.com, has been hosted on an Amazon Web Services EC2 server since October of 2008. This tutorial / software assumes you have an Amazon Web Services (AWS) account, and are running a debian-like EC2 server, mounting an Elastic Block Store (EBS). If any of this sounds like martian to you, check out http://aws.amazon.com for an overview.

So there I was, sitting in a design meeting, listening to (okay, mostly listening to) a developer talk about the different components of AWS which will be used as a part of his project. Bold added to help readability.

Now that I’m all set up in the Amazon cloud I’m starting to think about backups. Elastic Block Storage (EBS) on Amazon is great and the Snapshots (backups) can be generated with a few clicks from the Management Console, but, for a few reasons I’d like to set up my own backup scripts and here’s why:

Instant notifications for events received from your systems. Used by github.com

Supervisor is a client/server system that allows its users to monitor and control a number of processes on UNIX-like operating systems.

Clicking on a button or link slides the page over to reveal a hidden pane, one that usually contains secondary navigation, a form, or additional information.

HyperDB is a very advanced database class that replaces a few of the WordPress built-in database functions. The main differences are: * HyperDB can be connect to an arbitrary number of database servers, * HyperDB inspects each query to determine the appropriate database

Octopress is a framework designed by Brandon Mathis for Jekyll, the blog aware static site generator powering Github Pages. To start blogging with Jekyll, you have to write your own HTML templates, CSS, Javascripts and set up your configuration. But with Octopress All of that is already taken care of. Simply clone or fork Octopress, install dependencies and the theme, and you’re set.

The Debug Diagnostics Tool (DebugDiag) version 1.2 is now available. You can download the tool from the Microsoft Download Center at the following location:

WordPress Pricing Table plugin will help the admin to publish pricing table on WordPress page or post content. WordPress Pricing Table plugin has full featured but easy to use administration option to create pricing table. Use simple short-code [ahm-pricing-table id=999 template=template_name] (999=use any table id here and replace template with valid template name "green" or "gray" ) inside page or post content to embed pricing table

Part of our despair was personal, but a lot of it was professional. Here’s the thing: you may not know what your team lead does, but if they’re awesome the way Ben was, a huge number of problems get solved without you ever hearing about them, which frees you to work on actually shipping amazing products.

noty is a jQuery plugin that makes it easy to create alert, success, error, information and confirmation messages as an alternative the standard alert dialog. Each notification is added to a queue. (Except growl like notifications)

John Cleese on Creativity

Javascript application framework

Let's face it, your users need sweet little notifications to keep them all warm and fuzzy inside. Sticky allows you to send such messages with ease, and class. Quickly notify a user of software updates, process completions, or annoy them with registration reminders.

An unbelievably easy way to add style and validation to your forms. Forms are everywhere and, usually, suck. Formly makes adding forms to your site a bit more exciting. Easily add style, validation, and a more impressive user interaction with a single function.

Notification messages are an important part of the user experience and you can’t afford to omit them. A notification alert message should appear every time the user perform important tasks. Here are 10 jquery notification plugins that will allow you to send such messages with ease, and class.

I’m cranky. I complain about a lot of things. There’s a lot in the world of technology I don’t like, and that’s really to be expected—programming is a hilariously young discipline, and none of us have the slightest clue what we’re doing. Combine with Sturgeon’s Law, and I have a lifetime’s worth of stuff to gripe about.

First off, way too many workers, and limits set excessively high. The max worker count for php-fpm alone would bog your server down quite a bit. Uncapping the limits on a server won't necessarily speed it up but may actually have the opposite effect.

Run as many meetings as you want. Hang with co-workers and teams. No software or signups needed. Best of all, it's free.

As an ISV participating in AWS Solution Providers Program, nginx is offering an automated install script for use with AWS EC2 instances. This helper script is targeted at the developers who have just started using nginx and EC2, and who would like to get things up quickly and efficiently. Please check the action list below in order to prepare your virtual machine and nginx configuration.

Note: "VirtualHost" is an Apache term. Nginx does not have Virtual hosts, it has "Server Blocks" that use the server_name and listen directives to bind to tcp sockets.

At the end of February, I launched a side project, Loft Resumes, with a friend of mine, Emory Cash. Our tagline is “Style-Conscious Resumes for the Standout Job Seeker.” As you can tell from the Google Analytics screenshot below, from the time that we first tweeted about it on February 21st to mid-day March 31st, we’ve received over 81,000 visits (over 66,000 of them uniques,) and over 209,000 page views. We’re pleased. We’re even more pleased that it’s generated enough sales that we’re working like crazy every day to fulfill them.

These instructions are the rather verbose, but hopefully easy enough to follow, steps to build a new Linux server using Varnish, Nginx, W3 Total Cache, and WordPress, to build a WordPress blog on a Amazon Micro server (or equivalent), all costing under $15 a month, capable of sustaining 10 million hits per day, as measured by blitz.io.

Just as important as discovering security flaws is reporting the findings so that users can protect themselves and vendors can repair their products.

When talking about reports of tools that break into iPhones, it is very important to remember that the seller may be inclined to overemphasize its capabilities. It is also wise to keep in mind that the more sensational claims are the ones that tend to be picked up, and perhaps amplified, by the press. In this light, let’s talk about Micro Systemation’s XRY, a cracking/forensics tool for extracting data from iOS and Android devices.

TrendWeight can answer that question by analyzing your day to day weight changes.

Plenty of apps can track your weight. FatWatch will analyze it.

Know where you stand. Get where you want to be. With Aria, track your weight, % body fat, and BMI over time with a host of online graphs and mobile tools to help you reach your goals. Learn more or pre-order no

AudioSauna is a full-featured audio workstation with an easy-to-use and straightforward user interface. It enables using several advanced polyphonic synthesizers, samplers and live effects in real-time in the browser.

The WebGL Globe is an open platform for geographic data visualization. We encourage you to copy the code, add your own data, and create your own.

We are merchants of the highest quality, hand-selected and hand-prepared spices and herbs.

We decided to release these icons for free under a Creative Commons Attribution 3.0 license so more people like you can have easy access to consistent icons for their projects.

Over the years, we've shared a ton of tips for keeping yourself safe and healthy during an emergency. Here are some of our favorite clever survival tricks

Car repairs can drain your pocketbook fast, but you can do a wide range of repairs yourself, regardless of your technical skill. We're not just talking oil changes; provided you can hold a wrench, you can fix everything ranging from fuel filters to alternators. We'll detail the tools necessary for your DIY toolkit, where to turn to for help when you're making the repairs, and how to tackle some of the most common car problems yourself.

AutoMD's Do It Yourself and expert community has you covered. Just follow our easy step-by-step instructions in our auto repair manuals.

Here you can find the C# code examples for RabbitMQ tutorials. To successfully use the examples you will need a running RabbitMQ server

Smoothie Charts is a really small charting library designed for live streaming data. I built it to reduce the headaches I was getting from watching charts jerkily updating every second. What you're looking at now is pretty much all it does. If you like that, then read on.

The Redis project does not directly support win32/win64, however we look at interest to projects trying to make a win32/win64 port that is separated from the main project. Two such efforts already exists:

We really aggressively cache... basically everything. Virtually all pages accessed by (and subsequently served to) annonymous users are cached, whole cloth, via Output Caching. This isn't terribly interesting, but it is terribly fast. Perhaps more interesting, we use Redis as a caching layer for the entire network. Kyle recently mentioned the specs of the machine in passing. Prior to the NY move our Redis instance was in a virtual machine on a (lightly loaded) web tier machine.

By offering pipelined, asynchronous, multiplexed and thread-safe access to redis, BookSleeve enables efficient redis access even for the busiest applications.

The Cobb County Public Library System is a 17-branch system headquartered in Marietta, Georgia, where its staff members serve a diverse population of almost 700,000 people. Cobb is one of Georgia’s fastest-growing counties, and the Cobb County Public Library System is dedicated to being a resource center in the community by providing equal access to information, materials, and services.

Earth Class Mail's Virtual Mailroom is your own remotely managed mailroom, document center, payment processor, and more!

An MVC Chat Site Example using Long Polling

Create unique design with Bootstrap v2

IIS Transform Manager 1.0 Beta is a media-transform engine that enables on-demand media files to be converted in batches. One example of a media transform is transcoding Windows Media-formatted or MP4-formatted files into on-demand Smooth Streaming presentations for delivery to Silverlight clients. Another example is repackaging on-demand Smooth Streaming presentation files to the MPEG-2 Transport Stream (MPEG-2 TS) container format for delivery to Apple mobile digital devices.

If you’re a white-collar worker, hacking your body isn’t limited to the gym. In fact, what you do outside of the gym might be more important that what you do inside the gym

Here's how to rip those movies for glorious HD movies, anywhere you want them.

How to Pack Your Tumi Suiter

Packing a suitcase so that everything arrives unwrinkled is an art, but it's one everyone can learn.

The Transportation Security Administration (TSA) was formed to ensure America’s freedom to travel.  Instead, they have made air travel the most difficult means of mass transit in the United States, at the same time failing to make air travel any more secure.

CrossFit is the principal strength and conditioning program for many police academies and tactical operations teams, military special operations units, champion martial artists, and hundreds of other elite and professional athletes worldwide.

Credit union in the Atlanta area

Welcome to YardVPS, your one stop solution for unmanaged VPS's. We use Xen virtualization alongside with SolusVM to provide you un-restricted access to your VPS. Our plans are completely unmanaged and we do not offer any refunds on our plans. Using the latest Intel Quadcore Processors with DDR3 RAM to give you the performance you need.