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    <p>I know that it isn't really the answer on the question about background worker but maybe it's time to use "new" C# 5.0 feauture called <strong>async/await</strong>? I made some modifications in your code and tested it and all works without errors and freezes:</p> <pre><code> private bool cancelled; private bool started; public MainWindow() { InitializeComponent(); } private async void btnStart_Click(object sender, RoutedEventArgs e) { if (started) return; cancelled = false; started = true; try { await DoAsync(); } catch (Exception exception) { lblProgress.Content = "Error: " + exception.Message; return; } finally { started = false; } lblProgress.Content = cancelled ? "Cancel !" : "Finish !"; } private async Task DoAsync() { using (var sr = new StreamReader("C:\\File 1.txt")) { using (var sw = new StreamWriter("C:\\Out-File 1.txt")) { var fi = new FileInfo("C:\\File 1.txt"); long total = (char) fi.Length; int i = 0; string result; while (!sr.EndOfStream) { result = await sr.ReadLineAsync(); await sw.WriteLineAsync(result); i = i + (char) result.Length; ProgressChanged((int) ((decimal) i/(decimal) total*(decimal) 100)); if (cancelled) return; } } } } private void ProgressChanged(int progress) { this.lblProgress.Content = progress.ToString() + "%"; this.pb.Value = progress; } private void btnCancel_Click(object sender, RoutedEventArgs e) { cancelled = true; } </code></pre> <p>Also my advice about percent calculation is to check if it's changed in each iteration and then rise interface updates.</p>
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    1. COThis is a fine answer, but there are some scenarios where using .NET 4.5 (and thus C# 5) is not an option.
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    2. CO@Marton What about **Microsoft.Bcl.Async** nuget package?
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    3. COI usually try to avoid installing anything extra to solve an issue which is clearly fixable by just changing something small in my code.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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