The article describes the process of building a simple raffle app using Twilio, WebMatrix, and AppHarbor. The author generated unique entry codes for attendees to text in to enter the contest, handled incoming messages using Twilio's REST API, and updated the database with email addresses associated with each entry code. The app was deployed on AppHarbor, a service similar to Heroku, and ran smoothly at an event, drawing in a large number of participants and resulting in a successful winner. The author also created a mail merge to print out the generated codes on business cards and handouts.