2D Graphics C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Media;
using System.Windows.Data;
using System.Windows.Controls;
using System.Windows;
using System.Windows.Media.Imaging;
namespace Adsophic.PhotoEditor.GUILibrary.Imaging
{
    public static class ImageUtils
    {
        public static void SaveWindow(Window window, int dpi, string filename)
        {
            var rtb = new RenderTargetBitmap(
                (int)window.Width, //width 
                (int)window.Width, //height 
                dpi, //dpi x 
                dpi, //dpi y 
                PixelFormats.Pbgra32 // pixelformat 
                );
            rtb.Render(window);
            SaveRTBAsPNG(rtb, filename);
        }
        private static void SaveRTBAsPNG(RenderTargetBitmap bmp, string filename)
        {
            var enc = new System.Windows.Media.Imaging.PngBitmapEncoder();
            enc.Frames.Add(System.Windows.Media.Imaging.BitmapFrame.Create(bmp));
            using (var stm = System.IO.File.Create(filename))
            {
                enc.Save(stm);
            }
        }
        public static ImageSource GetImageFromUri(Uri uri)
        {
            Binding imageSourceBinding = new Binding();
            imageSourceBinding.Source = uri;
            Image newImage = new Image();
            newImage.SetBinding(Image.SourceProperty,
                imageSourceBinding);
            if (newImage.Source == null)
                return null;
            return newImage.Source.Clone();
        }
    }
}