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Write Jpeg file from BitmapSource

using System; using System.Collections.Generic; using System.Text; using System.Windows.Media.Imaging; using System.IO;     class UseBitmapCodecs     {         static void WriteJpeg(string fileName, int quality, BitmapSource bmp)         {             JpegBitmapEncoder encoder = new JpegBitmapEncoder();             BitmapFrame outputFrame = BitmapFrame.Create(bmp);             encoder.Frames.Add(outputFrame);             encoder.QualityLevel = quality;             using (FileStream file = File.OpenWrite(fileName))             {                 encoder.Save(file);             }         }     }