Automatic junk code adder

JunkCode.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace JunkCodeAdder
{
    class Program
    {
        private static string _dir = "/home/samueltulach/Downloads/ObfuscateTest/Fuzion/src";
        private static int _varcount = 100;
        private static int _varlength = 50;

        private static Random random = new Random();
        public static string RandomString(int length)
        {
            const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZqwertzuioplkjhgfdsayxcvbnm";
            return new string(Enumerable.Repeat(chars, length)
              .Select(s => s[random.Next(s.Length)]).ToArray());
        }

        static string Generate()
        {
            List<string> variables = new List<string>();
            string code = "";

            // Generate random variable names
            for (int i = 0; i < _varcount; i++)
            {
                variables.Add(RandomString(_varlength));
            }

            // Generate varibale initialization and printf
            // Printf because some compilers might without it delete our junk (optimalization)
            foreach (string varname in variables)
            {
                code += "int " + varname + " = " + random.Next(0, 379) + ";";
                // printf ("JUNK: %d", varname);
                code += "printf(\"JUNK: %d\", " + varname + ");";
            }

            return code;
        }

        static void Main(string[] args)
        {
            Console.WriteLine("DIR: " + _dir);

            // Get all .cpp files in directory
            string[] cppfiles = Directory.GetFiles(_dir, "*.cpp", SearchOption.AllDirectories);

            // Loop all files
            foreach (string file in cppfiles)
            {
                // Print it because why not
                Console.WriteLine("FILE: " + file);

                // Read all lines and loop it
                string[] lines = File.ReadAllLines(file);
                for (int i = 0; i < lines.Length; i++)
                {
                    // Check if there is a function on line
                    if (lines[i].Contains("void"))
                    {
                        // Line contains a function definition
                        // Now we need to check if the function bracket is on same line or not
                        if (lines[i].Contains("{"))
                        {
                            // Bracket is on same line
                            Console.WriteLine("Function found on " + i);
                            lines[i] += Generate();
                        } else if (!lines[i].Contains("{") && lines[i + 1].Contains("{"))
                        {
                            // Bracket is under the function
                            Console.WriteLine("Function found on " + i);
                            lines[i + 1] += Generate();
                        }
                        else
                        {
                            // Ignoring
                            // No function found
                        }
                    }
                }

                // Write it back to file
                File.WriteAllLines(file, lines);
            }
        }
    }
}