mCleaner.App.OnStartup C# (CSharp) Method

        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);
            if (e.Args.Length == 2 && e.Args[0] == "shred")
            {
                StaticResources.strShredLocation = e.Args[1];
                if (Directory.Exists(StaticResources.strShredLocation))
                {
                    var strSizeInMB = FileOperations.GetDirectorySizeInMB(StaticResources.strShredLocation);
                    if (strSizeInMB > 64)
                        if (MessageBox.Show("mCleaner can not shred more than 64 MB at a time. Do you want to continue for partial shredding?", "mCleaner", MessageBoxButton.YesNo, MessageBoxImage.Question) == MessageBoxResult.No)
                            Application.Current.Shutdown();
                }
            }
            else
            {
                StaticResources.strShredLocation = string.Empty;
                // force one instance of this application
                bool force_terminate = false;
                Process curr = Process.GetCurrentProcess();
                Process[] procs = Process.GetProcessesByName(curr.ProcessName);
                foreach (Process p in procs)
                {
                    if ((p.Id != curr.Id) && (p.MainModule.FileName == curr.MainModule.FileName))
                    {
                        force_terminate = true;
                        curr = p;
                        break;
                    }
                }
                if (force_terminate)
                {
                    MessageBox.Show("mCleaner is already running", "mCleaner", MessageBoxButton.OK, MessageBoxImage.Information);
                    SetForegroundWindow(curr.MainWindowHandle);
                    Process.GetCurrentProcess().Kill();
                }
            }

            // check permission
            if (!Permissions.IsUserAdministrator)
            {
                MessageBox.Show("You must be an administrator to run this program", "mCleaner", MessageBoxButton.OK, MessageBoxImage.Exclamation);
                Process.GetCurrentProcess().Kill();
                return;
            }

            // Enable needed privileges
            Permissions.SetPrivileges(true);

            Version version = Assembly.GetEntryAssembly().GetName().Version;
            string s_version = version.ToString();

            if (s_version != Settings.Default.Version)
            {
                Settings.Default.Upgrade();
                Settings.Default.Version = s_version;
                Settings.Default.Save();
            }
            if (Settings.Default.DupChecker_MaxSize <= 0)
            {
                Settings.Default.DupChecker_MaxSize = 9223372036854775;
                Settings.Default.Save();
            }

            // check for clamwin installation and
            // decide which database to use
            if (e.Args.Length == 2 && e.Args[0] == "shred")
            {
                //do nothing in this case
            }
            else
             CommandLogic_Clam.I.CheckClamWinInstallation();

            if (Settings.Default.DupChecker_DuplicateFolderPath == string.Empty)
            {
                Settings.Default.DupChecker_DuplicateFolderPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Duplicates");
                Settings.Default.Save();
            }
        }