Convert Main.Run to an instance method. Convert locals to fields.

This will prepare us to be able to extract out classes.

csharp/BrainmessShort/Main.cs

@@ -5,18 +5,24 @@ namespace BrainmessShort
 {
    public class Brainmess
    {
+        private readonly string program;
+        private int pc = 0;
+        private readonly int[] tape = new int[5000];
+        private int tc = 2500;
+        public Brainmess(string program) 
+        {
+            this.program = program;
+        }
+
         public static void Main(string[] args)
         {       
             var reader = File.OpenText(args[0]);
-            Run(reader.ReadToEnd());
+            new Brainmess(reader.ReadToEnd()).Run();
             reader.Close();
         }
 
-        public static void Run(string program) 
+        public void Run() 
         {
-            int pc = 0;
-            int[] tape = new int[5000];
-            int tc = 2500;
             while(pc < program.Length)
             {
                 char instruction = program[pc];