convert image to string and back

namespaces used :
using System.Windows.Controls; using System.IO; using System.Windows.Media.Imaging;
using System.Windows.Media;

Stream to String :

BitmapImage bimg = new BitmapImage();
                bimg.SetSource(photoStream); //photoStream is a stream containing data for a photo
                
                byte[] bytearray = null;
                using (MemoryStream ms = new MemoryStream())
                {
                    WriteableBitmap wbitmp = new WriteableBitmap(bimg);
                    wbimg.SaveJpeg(ms, wbitmp.PixelWidth, wbitmp.PixelHeight, 0, 100);
                    ms.Seek(0, SeekOrigin.Begin);
                    bytearray = ms.GetBuffer();
                }
                string str = Convert.ToBase64String(bytearray);

String to Stream and then to Image :

byte[] data = Convert.FromBase64String(str);
                        
            Stream memStream = new MemoryStream(data);

            WriteableBitmap wbimg = PictureDecoder.DecodeJpeg(memStream);

            image1.Source = wbimg;