public class Sandbox
{
	public void TestMetadata
	{
		var filePath = "c:\\data\\car.jpg";
		FileInfo originalImage = new FileInfo(filePath);

		if (originalImage.Exists)
		{
			JpegBitmapDecoder decoder = null;
			
			using (Stream imageStream = File.Open(originalImage.FullName, FileMode.Open, FileAccess.ReadWrite, FileShare.None))
			{
				decoder = new JpegBitmapDecoder(imageStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad);
			}			

			var bitmapFrame = decoder.Frames[0];
			var metadata = (BitmapMetadata)bitmapFrame.Metadata;

			// SubjectLocation
			// Indicates the location and area of the main subject in the overall scene.
			var subjectLocation = metadata.GetQuery("/app1/ifd/exif:{uint=37396}");

			// GPSLatitude
			// Indicates the latitude. The latitude is expressed as three RATIONAL values giving the degrees, minutes, 
			// and seconds, respectively. When degrees, minutes and seconds are expressed, the format is dd/1,mm/1,ss/1. 
			// When degrees and minutes are used and, for example, fractions of minutes are given up to two decimal places, 
			// the format is dd/1,mmmm/100,0/1.
			var gpsLatitude = metadata.GetQuery("/app1/ifd/exif:{uint=2}");
			
			// GPSLongitude
			// Indicates the longitude. The longitude is expressed as three RATIONAL values giving the degrees, minutes, 
			// and seconds, respectively. When degrees, minutes and seconds are expressed, the format is ddd/1,mm/1,ss/1. 
			// When degrees and minutes are used and, for example, fractions of minutes are given up to two decimal places, 
			// the format is ddd/1,mmmm/100,0/1.
			var gpsLongitude = metadata.GetQuery("/app1/ifd/exif:{uint=4}");
			
			// UserComment
			// A tag for Exif users to write keywords or comments on the image besides those in <ImageDescription>, and 
			// without the character code limitations of the <ImageDescription> tag.
			var userComment = metadata.GetQuery("/app1/ifd/exif:{uint=37510}");
			
			// ImageDescription:
			// A character string giving the title of the image. It may be a comment such as "1988 company picnic" or the 
			// like. Two-bytes character codes cannot be used. When a 2-bytes code is necessary, the Exif Private tag 
			// <UserComment> is to be used.
			var imageDescription = metadata.GetQuery("/app1/ifd/exif:{uint=270}");

			if (bitmapFrame != null)
			{
				BitmapMetadata metadataClone = (BitmapMetadata)bitmapFrame.Metadata.Clone();
				if (metadataClone != null)
				{
					metadata.SetQuery("/app1/ifd/exif:{uint=2}", 38.12345);    						// GPS Latitude
					metadata.SetQuery("/app1/ifd/exif:{uint=4}", -80.54321);                          // GPS Longitude
					metadata.SetQuery("/app1/ifd/exif:{uint=270}", "This is a test description");	// Image Description
					metadata.SetQuery("/app1/ifd/exif:{uint=37396}", "101 Main Street, Anytown, USA");	// Subject Location
					metadata.SetQuery("/app1/ifd/exif:{uint=37510}", "This is a a test comment");			// User Comment

					JpegBitmapEncoder encoder = new JpegBitmapEncoder();
					encoder.Frames.Add(BitmapFrame.Create(bitmapFrame, bitmapFrame.Thumbnail, metadataClone, bitmapFrame.ColorContexts));
					originalImage.Delete();
					using (Stream jpegStreamOut = File.Open(filePath, FileMode.CreateNew, FileAccess.ReadWrite))
					{
						encoder.Save(jpegStreamOut);
					}
				}
			}
		}
	}
}