Winforms background worker gets stuck

I am trying to build a simple code that joins csv files into one distinct file, but my background worker seems to have a mind of its own and my code gets stuck every time. Here is my code for joining the file using the background worker:

private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
    {
        try
        {
            if (string.IsNullOrEmpty(saveFilePath))
            {
                this.Invoke(new MethodInvoker(delegate
                {
                    btnBrowseSave.PerformClick();
                }));
            }
            if (!string.IsNullOrEmpty(saveFilePath))
            {
                if (dragEventArgs != null)
                    files = (string[])dragEventArgs.Data.GetData(DataFormats.FileDrop);

                int filesCount = 0, rowsCount = 0;
                foreach (string file in files)
                {
                    filesCount++;
                    int fileTotalLines = File.ReadAllLines(file).Length;

                    this.Invoke(new MethodInvoker(delegate
                    {
                        lblFileName.Text = "Loading file: " + file.Substring(file.LastIndexOf("\\") + 1);
                        lblTotalFiles.Text = "File " + filesCount + " of " + files.Length;
                    }));

                    using (StreamReader reader = new StreamReader(file))
                    {
                        using (StreamWriter writer = new StreamWriter(saveFilePath))
                        {
                            while (!reader.EndOfStream)
                            {
                                try
                                {
                                    while (stopPosition > rowsCount)
                                    {
                                        reader.ReadLine();
                                        rowsCount++;
                                    }
                                    string email = reader.ReadLine().Trim();
                                    if (!string.IsNullOrEmpty(email) && !dicEmails.ContainsKey(email))
                                    {
                                        dicEmails.Add(email, null);
                                        writer.WriteLine(email);
                                    }
                                    rowsCount++;
                                    stopPosition++;

                                    backgroundWorker.ReportProgress((rowsCount * 100 / fileTotalLines), (int)ProgressType.Row);
                                    if (backgroundWorker.CancellationPending)
                                        return;
                                }
                                catch (Exception ex)
                                {
                                    hadReadErrors = true;
                                }
                            }
                        }
                    }
                    backgroundWorker.ReportProgress(0, (int)ProgressType.Row);
                    backgroundWorker.ReportProgress((filesCount * 100 / files.Length), (int)ProgressType.File);
                }
            }
        }
        catch (Exception ex)
        {
            hadReadErrors = true;
            MessageBox.Show(ex.Message);
        }
        finally
        {
            backgroundWorker.Dispose();
        }
    }

    private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        try
        {
            switch ((int)e.UserState)
            {
                case (int)ProgressType.Row:
                    lblFileProgress.Text = e.ProgressPercentage + "%";
                    fileProgressBar.Value = e.ProgressPercentage;
                    break;
                case (int)ProgressType.File:
                    lblTotalProgress.Text = e.ProgressPercentage + "%";
                    totalProgressBar.Value = e.ProgressPercentage;
                    break;
            }
        }
        catch (Exception ex) { }
    }

When I run in debug mode and go with the debugger I don't see any problems, but when I let the code run it self it gets stuck and crashes. Can someone PLEASE help me and tell me what am I missing out here ?

Here is the exception:

Managed Debugging Assistant 'ContextSwitchDeadlock' has detected a problem in    
'C:\Users\Develop\Desktop\ExcelBuilder\ExcelBuilder\bin\Debug\ExcelBuilder.vshost.exe'.

Additional information: The CLR has been unable to transition from COM context 0x90fb78 
to COM context 0x90fc30 for 60 seconds. The thread that owns the destination
context/apartment is most likely either doing a non pumping wait or processing a very 
long running operation without pumping Windows messages. This situation generally has 
a negative performance impact and may even lead to the application becoming non 
responsive or memory usage accumulating continually over time. To avoid this problem, 
all single threaded apartment (STA) threads should use pumping wait primitives 
(such as CoWaitForMultipleHandles) and routinely pump messages during long running operations.