Autoincrement Version in Visual Studio

using System;
using System.Diagnostics;
using System.IO;
using System.Text.RegularExpressions;

namespace vbinc
{
    class Program
    {
        private static int _incMajor = 0;
        private static int _incMinor = 0;
        private static int _incRevno = 0;
        private static int _incBuild = 0;

        private static bool _bshow;
        private static bool _bassemply;
        private static bool _bfile;

        private const string Pattern1 = 
                    @"\[assembly\: AssemblyVersion\(""(\d{1,})\.(\d{1,})\.(\d{1,})\.(\d{1,})""\)\]";
        private const string Pattern2 =
                    @"\[assembly\: AssemblyFileVersion\(""(\d{1,})\.(\d{1,})\.(\d{1,})\.(\d{1,})""\)\]";

        private const string VersionFile = @"..\..\Properties\AssemblyInfo.cs";
        private const string BackupFile = @"..\..\Properties\AssemblyInfo.~cs";

        static void Main(string[] args)
        {
            try
            {
                if(!ParseCmdLine(args))
                {
                    ShowUsage();
                    return;
                };

                string str = File.ReadAllText(VersionFile);
                string result;
                

                if (_bassemply || _bshow) result = GetResult(Pattern1, str, "AssemblyVersion");
                else result = str;
                if (_bfile || _bshow) result = GetResult(Pattern2, result, "AssemblyFileVersion");

                if (!_bshow)
                {
                    File.Delete(BackupFile);
                    File.Copy(VersionFile, BackupFile);
                    File.WriteAllText(VersionFile, result);
                }
                forDebug();
            }
            catch (Exception ex)
            {
                Console.WriteLine("ERR: " + ex.Message);
            }
        }

        [Conditional("DEBUG")]
        private static void forDebug()
        {
            Console.ReadKey();
        }

        public static bool ParseCmdLine(string[] args)
        {
            if (args.Length == 0) return false;
            string astr;

            foreach (string arg in args)
            {
                if(arg.StartsWith("-"))
                {
                    astr = arg.ToLower();
                    if (astr.Contains("a")) _bassemply = true;
                    if (astr.Contains("f")) _bfile = true;
                    if (astr.Contains("1")) _incMajor = 1;
                    if (astr.Contains("2")) _incMinor = 1;
                    if (astr.Contains("3")) _incBuild = 1;
                    if (astr.Contains("4")) _incRevno = 1;
                    if (astr.Contains("c")) _bshow = true;
                }

                if (arg.ToLower().StartsWith("-h")) return false;

                if (_bshow)
                {
                    _incMajor = 0;
                    _incMinor = 0;
                    _incBuild = 0;
                    _incRevno = 0;
                }
            }
            return true;
        }

        public static void ShowUsage()
        {
            Console.WriteLine("vbinc v{0}", Process.GetCurrentProcess().MainModule.FileVersionInfo.FileVersion);

            Console.WriteLine("Autoincrement version in c# projects. by vdasus.com");
            Console.WriteLine("");
            Console.WriteLine("usage: vbinc -[af1234]|[-c]|[-h]");
            Console.WriteLine("Options");
            Console.WriteLine("\t-a Increment assembly version");
            Console.WriteLine("\t-f Increment file version");
            Console.WriteLine("\t-1 Increment +1.x.x.x");
            Console.WriteLine("\t-2 Increment x.+1.x.x");
            Console.WriteLine("\t-3 Increment x.x.+1.x");
            Console.WriteLine("\t-4 Increment x.x.x.+1");
            Console.WriteLine("\t-c Just show current version");
            Console.WriteLine("\t-h this help screen.");
            Console.WriteLine("");
            Console.WriteLine("Example: vbinc -af34");
            Console.WriteLine("Increments assembly and file build and revision numbers.");

            Console.WriteLine("");

            Environment.Exit(0);
        }

        private static string GetResult(string pattern, string str, string app)
        {

            Regex r = new Regex(pattern);
            Match m = r.Match(str);

            string rz = string.Format("[assembly: {4}(\"{0}.{1}.{2}.{3}\")]"
                , GetInc(m.Groups[1].Value, _incMajor)
                , GetInc(m.Groups[2].Value, _incMinor)
                , GetInc(m.Groups[3].Value, _incBuild)
                , GetInc(m.Groups[4].Value, _incRevno)
                , app);

            Console.WriteLine(rz);

            return r.Replace(str, rz);
        }

        private static int GetInc(string aVer, int adoInc)
        {
            return Convert.ToInt32(aVer) + adoInc;
        }
    }
}