MARKUS

        public bool ExportingFile(Visual visual, double pageWidth, double pageHeight, string fileName)

        {

            bool result = false;

            try

            {

                JpegBitmapEncoder png = new JpegBitmapEncoder();

                RenderTargetBitmap renderBitmap = new RenderTargetBitmap((int)pageWidth, (int)pageHeight, 96d, 96d, PixelFormats.Default);

                DrawingVisual drawingVisual = new DrawingVisual();

                DrawingContext drawingContext = drawingVisual.RenderOpen();

                VisualBrush visualBrush = new VisualBrush(visual);

                drawingContext.DrawRectangle(visualBrush, null, new System.Windows.Rect(new System.Windows.Point(0, 0), new System.Windows.Point(pageWidth, pageHeight)));

                drawingContext.Close();

                renderBitmap.Render(drawingVisual);

                png.Frames.Add(BitmapFrame.Create(renderBitmap));

                using (FileStream fileStream = File.Create(fileName))

                {

                    png.Save(fileStream);

                    //encoder = null;

                    //renderBitmap.Clear();

                    //drawingVisual = null;

                    //drawingContext.Close();

                    //visualBrush = null;

                    //fileStream.Close();

                    //fileStream.Dispose();

                    result = true;

                }

            }

            catch (Exception ex)

            {

                throw new Exception("ExportingFile Error ", ex);

            }

            finally

            {

                GC.Collect();

                GC.WaitForPendingFinalizers();

                GC.Collect();

            }

            return result;

        }