Question

This is the code:

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) 
{
    BackgroundWorker worker = sender as BackgroundWorker; 
    List<string> tempNamesAndTexts = new List<string>();
    string tempDownload = downloadContent();
    GetProfileNames(tempDownload);
    GetTextFromProfile(tempDownload);
    for (int i = 0; i < names.Count; i++)
    {
        tempNamesAndTexts.Add(names[i] + " " + texts[i]);            
    }
    if (InvokeRequired)
    {
        BeginInvoke(new Action(() => tempNamesAndTexts.ForEach(Item => textBox1.AppendText(Item + Environment.NewLine))));
    }
    while (true)
    {
        namesAndTexts = new List<string>();
        if ((worker.CancellationPending == true))
        {
            e.Cancel = true;
            break;
        }
        else
        {
            string content = downloadContent();
            GetProfileNames(content);
            GetTextFromProfile(content);
            for (int i = 0; i < names.Count; i++)
            {
                 namesAndTexts.Add(names[i] + " " + texts[i]);
            }
            if (InvokeRequired)
            {
                bool result = tempNamesAndTexts.SequenceEqual(namesAndTexts);
                if (result == true)
                {
                }
                else
                {
                    var t = namesAndTexts.Last();

                    if (textBox1.InvokeRequired)
                    {
                        BeginInvoke(new Action(() => textBox1.AppendText(t + Environment.NewLine)), null);
                        return;
                    }
                }
            }
            reader.Close();
            response.Close();
            Thread.Sleep(30000);
        }
    }
}

The problem is in this line:

BeginInvoke(new Action(() => textBox1.AppendText(t + Environment.NewLine)), null);
                                    return;

If i will put a reutn; or break; it will keep adding the variable t nonstop to the textBox. And i want it to be added only once. And the loop will continue but that the variable t will be added only once.

Answer 1

Hope I understand well your question, it sounds that you simply need to check on

if(string.IsNullOrEmpty(textBox1.Text)) //ADD NEW TEXT ONLY IF THERE IS NO ANY
  BeginInvoke(new Action(() => textBox1.AppendText(t + Environment.NewLine)), null);

This without return naturally, so the while loop will continue to run.

If this is not what you’re asking for, please clarify.