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I'm trying to come up with an unobtrusive way to to display minor error messages to a user. So I've added a statusbar to my form, <StatusBar Margin="0,288,0,0" Name="statusBar" Height="23" VerticalAlignment="Bottom"> <TextBlock Name="statusText">Ready.</TextBlock> </StatusBar> And then when they click an "Add" button, it should do some stuff, or display an error message: private void DownloadButton_Click(object sender, RoutedEventArgs e) { addressBar.Focus(); var url = addressBar.Text.Trim(); if (string.IsNullOrEmpty(url)) { statusText.Text = "Nothing to add."; return; } if (!url.Contains('.')) { statusText.Text = "Invalid URL format."; return; } if (!Regex.IsMatch(url, @"^\w://")) url = "http://" + url; addressBar.Text = ""; But the message just sits there for the life of the app... I think I should reset it after about 5 seconds... how can I set a timer to do that? Bonus: How do I give it a nifty fade-out effect as I do so? I've created a System.Timers.Timer , private Timer _resetStatusTimer = new Timer(5000); void _resetStatusTimer_Elapsed(object sender, ElapsedEventArgs e) { statusText.Text = "Ready"; } But the Elapsed event runs on a different thread than the UI, which it doesn't like... how to I get around that?

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