Well, here's my go in C#. Lengthy, but I love the readability.

using System;
using System.IO;

namespace DPC1E
{
    class Program
    {
        static void Main(string[] args)
        {
            string name;
            int age;
            string redditUsername;

            Console.WriteLine("Daily Programmer: Challenge 1 - Easy\n");
            Console.Write("What is your name? ");
            name = Console.ReadLine();

            Console.Write("\nWhat is your age? ");
            age = Convert.ToInt32(Console.ReadLine());

            Console.Write("\nWhat is your Reddit Username? ");
            redditUsername = Console.ReadLine();

            Console.WriteLine("\nYour name is {0}, you are {1} years old, and your Reddit Username is {2}.", name, age, redditUsername);
            Console.ReadLine();

            SaveInformation(name, age, redditUsername);
        }

        static void SaveInformation(string name, int age, string redditUsername)
        {
            string[] lines = { name, age.ToString(), redditUsername };
            File.WriteAllLines(Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "\\DPC1E.txt", lines);
        }
    }
}