Inheritance: System.Diagnostics.TraceListener
        void TestVideoCapture_Load(object sender, EventArgs e)
        {
            sourceFilenameTextBox.Text = Settings.Default.WorkingFolder;

            listener = new MyListener(this.TraceMessageTextBox);
            Trace.Listeners.Add(listener);
        }
        void TestVideoCapture_Load(object sender, EventArgs e)
        {
            sourceFilenameTextBox.Text = "";

            listener = new MyListener(this.TraceMessageTextBox);
            Trace.Listeners.Add(listener);

            sourceFilenameTextBox_TextChanged(null, null);
        }