ScreenToGif.Windows.Recorder.Normal_Elapsed C# (CSharp) Method

        private void Normal_Elapsed(object sender, EventArgs e)
        {
            //Get the actual position of the form.
            var lefttop = Dispatcher.Invoke(() => new Point((int)((Left + Constants.LeftOffset) * _scale), (int)((Top + Constants.TopOffset) * _scale)));

            //Take a screenshot of the area.
            var bt = Native.Capture(_size, lefttop.X, lefttop.Y);

            if (bt == null) return;

            string fileName = $"{_pathTemp}{FrameCount}.bmp";

            ListFrames.Add(new FrameInfo(fileName, FrameRate.GetMilliseconds(_snapDelay)));

            ThreadPool.QueueUserWorkItem(delegate { AddFrames(fileName, new Bitmap(bt)); });

            FrameCount++;
        }