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public Bitmap ResizePicByWidth(Image sourceImage, double newWidth)
        {
            double sizeFactor = newWidth / sourceImage.Width;
            double newHeigth = sizeFactor * sourceImage.Height;
            Bitmap newImage = new Bitmap((int)newWidth, (int)newHeigth);
            using (Graphics g = Graphics.FromImage(newImage))
            {
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.DrawImage(sourceImage, new Rectangle(0, 0, (int)newWidth, (int)newHeigth));
            }
            return newImage;
        }					

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        private void PruefePfadContextMenuIcon(string setting, Bitmap button, ToolStripMenuItem contextMenuButton)
        {
            if (setting != "")
            {
                button = new Bitmap(setting);
                ResizeImage resizer = new ResizeImage();
                contextMenuButton.Image = resizer.ResizePicByWidth(button, 16.0);
            }
        }					

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            Bitmap exportbutton = null;
            PruefePfadContextMenuIcon(Settings.Default.ExportButton, exportbutton, nodeExportierenToolStripMenuItem);