Some reorg so I can have the original inputs

Day2/Day2.cs

@@ -0,0 +1,61 @@
+using System;
+using System.IO;
+using System.Linq;
+
+namespace Advent
+{
+    public static class Day2
+    {
+        public static void Execute()
+        {
+            for (var noun = 0; noun <= 99; noun++)
+                for (var verb = 0; verb <= 99; verb++)
+                {
+                    var result = Calculate(noun, verb);
+
+                    if (result == 19690720)
+                        Console.WriteLine(100 * noun + verb);
+                }
+        }
+
+        private static int Calculate(int noun, int verb)
+        {
+            var lines = File.ReadAllLines(@".\Day2\input.txt");
+
+            var codes = lines[0].Split(',').Select(int.Parse).ToArray();
+
+            codes[1] = noun;
+            codes[2] = verb;
+
+            var position = 0;
+            var done = false;
+
+            while (!done)
+            {
+                switch (codes[position])
+                {
+                    case 1:
+                        codes[codes[position + 3]] = codes[codes[position + 1]] + codes[codes[position + 2]];
+
+                        position += 4;
+
+                        break;
+
+                    case 2:
+                        codes[codes[position + 3]] = codes[codes[position + 1]] * codes[codes[position + 2]];
+
+                        position += 4;
+
+                        break;
+
+                    case 99:
+                        done = true;
+
+                        break;
+                }
+            }
+
+            return codes[0];
+        }
+    }
+}