worker_src = new BackgroundWorker();
                worker_src.WorkerReportsProgress = true;
                worker_src.DoWork += Worker_src_DoWork;
                worker_src.ProgressChanged += Worker_src_ProgressChanged;
                worker_src.RunWorkerCompleted += Worker_src_RunWorkerCompleted;
                worker_src.RunWorkerAsync();



    private void Worker_src_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            this.CurrentProgress_src = e.ProgressPercentage;
        }

///Твой метод, по которому ты хочешь смотреть прогресс
    private void DoWork(object sender, DoWorkEventArgs e)
        {
//наращиваешь значение прогресса
           curworkedspravrowindex++;
        }

  }
        private int currentProgress_src = 0;
        public int CurrentProgress_src
        {
            get { return this.currentProgress_src; }
            private set
            {
                if (this.currentProgress_src != value)
                {
                    this.currentProgress_src = value;
                    OnPropertyChanged();
                }
            }
        }
        public int rowcount_src { get; set; } = 0;
        private int _curworkedspravrowindex_src = 0;
        public int curworkedspravrowindex_src
        {
            get
            { return _curworkedspravrowindex_src; }
            set
            {
                _curworkedspravrowindex_src = value;
                worker_src.ReportProgress(_curworkedspravrowindex_src * 100 / rowcount_src);
                progressText_src = _curworkedspravrowindex_src.ToString() + " из " + rowcount_src.ToString();
            }
        }