How to: Encode a JPEG for Windows Phone and Save to the Pictures Library

using System.IO;
using System.IO.IsolatedStorage;
using Microsoft.Phone;
using Microsoft.Xna.Framework.Media;
using System.Windows.Resources;
using System.Windows.Media.Imaging;

Source=”TestImage.jpg”

<Image 
    Height="395" 
    HorizontalAlignment="Left" 
    Margin="6,6,0,0" 
    Name="image1" 
    Stretch="Fill" 
    VerticalAlignment="Top" 
    Width="468"
    Source="TestImage.jpg"/>

// Save images to the camera roll album by default.
radioButtonCameraRoll.IsChecked = true;

        private void btnSave_Click(object sender, RoutedEventArgs e)
        {
            // Create a file name for the JPEG file in isolated storage.
            String tempJPEG = "TempJPEG";

            // Create a virtual store and file stream. Check for duplicate tempJPEG files.
            var myStore = IsolatedStorageFile.GetUserStoreForApplication();
            if (myStore.FileExists(tempJPEG))
            {
                myStore.DeleteFile(tempJPEG);
            }

            IsolatedStorageFileStream myFileStream = myStore.CreateFile(tempJPEG);


            // Create a stream out of the sample JPEG file.
            // For [Application Name] in the URI, use the project name that you entered 
            // in the previous steps. Also, TestImage.jpg is an example;
            // you must enter your JPEG file name if it is different.
            StreamResourceInfo sri = null;
            Uri uri = new Uri("[Application Name];component/TestImage.jpg", UriKind.Relative);
            sri = Application.GetResourceStream(uri);

            // Create a new WriteableBitmap object and set it to the JPEG stream.
            BitmapImage bitmap = new BitmapImage();
            bitmap.CreateOptions = BitmapCreateOptions.None; 
            bitmap.SetSource(sri.Stream);
            WriteableBitmap wb = new WriteableBitmap(bitmap);

            // Encode the WriteableBitmap object to a JPEG stream.
            wb.SaveJpeg(myFileStream, wb.PixelWidth, wb.PixelHeight, 0, 85);
            myFileStream.Close();

            // Create a new stream from isolated storage, and save the JPEG file to the media library on Windows Phone.
            myFileStream = myStore.OpenFile(tempJPEG, FileMode.Open, FileAccess.Read);

            // Save the image to the camera roll or saved pictures album.
            MediaLibrary library = new MediaLibrary();

            if (radioButtonCameraRoll.IsChecked == true)
            {
                // Save the image to the camera roll album.
                Picture pic = library.SavePictureToCameraRoll("SavedPicture.jpg", myFileStream);
                MessageBox.Show("Image saved to camera roll album");
            }
            else
            {
                // Save the image to the saved pictures album.
                Picture pic = library.SavePicture("SavedPicture.jpg", myFileStream);
                MessageBox.Show("Image saved to saved pictures album");
            }
            
            myFileStream.Close();
        }