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How to pass an array as a parameter for doWork in C#
private void button1_Click(object sender, EventArgs e)
{
    BackgroundWorker worker = new BackgroundWorker;
    worker.WorkerReportsProgress = true;
    worker.ProgressChanged += ProgressChanged;
    worker.DoWork += ReadStream;
    //need to pass the comoBox Texts from here!!!
    string start = comboBox1.Text;
    string end = comboBox2.Text;
    worker.RunWorkerAsync();
}

private void ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    UpdateProgressBar(e.ProgressPercentage);
    comboBox1.Text = e.UserState.ToString();
}

private void ReadStream(object sender, DoWorkEventArgs doWorkEventArgs)
{

    BackgroundWorker worker = sender as BackgroundWorker;
    string line;
    //and use the values here !!!!
    using (StreamReader sr = new StreamReader("file", System.Text.Encoding.ASCII))
    {
        while (!sr.EndOfStream)
        {
            line = sr.ReadLine();
            worker.ReportProgress(line.Length);
        }

    }
}

string[] texts = new string[] {start, end};
worker.RunWorkerAsync(texts);

string[] extracted = (string[])doWorkEventArgs.Argument;
string start = extracted[0];
string end = extracted[1];

worker.RunWorkerAsync(array);

doWorkEventArgs.Argument