TASSOGRAPHY

public static void AddMetadataPadding(BitmapMetadata bitmapMetadata, uint paddingAmount)
{
    // Queries for the EXIF, IFD & XMP Padding
    string exifPadding = "/app1/ifd/exif/PaddingSchema:Padding";
    string ifdPadding = "/app1/ifd/PaddingSchema:Padding";
    string xmpPadding = "/xmp/PaddingSchema:Padding";

    // Ensure we have enough EXIF padding
    if (Convert.ToInt32(bitmapMetadata.GetQuery(exifPadding)) < paddingAmount)
    {
        bitmapMetadata.SetQuery(exifPadding, paddingAmount);
    }

    // Ensure we have enough XMP padding
    if (Convert.ToInt32(bitmapMetadata.GetQuery(xmpPadding)) < paddingAmount)
    {
        bitmapMetadata.SetQuery(xmpPadding, paddingAmount);
    }

    // Ensure we have enough IFD padding
    if (Convert.ToInt32(bitmapMetadata.GetQuery(ifdPadding)) < paddingAmount)
    {
        bitmapMetadata.SetQuery(ifdPadding, paddingAmount);
    }
}

public static void WriteMetadata(string sourceFile, string destinationFile, BitmapMetadata newMetadata)
{

    BitmapCreateOptions createOptions = BitmapCreateOptions.PreservePixelFormat
                                                             | BitmapCreateOptions.IgnoreColorProfile;

    // Open Source file (used to get Image and Thumbnail)
    using (Stream sourceStream = File.Open(sourceFile, FileMode.Open, FileAccess.Read))
    {
        // Decode the Source
        BitmapDecoder sourceDecoder = BitmapDecoder.Create(sourceStream, createOptions, BitmapCacheOption.None);

        // Create a new jpeg frame, replacing the destination metadata with the source
        BitmapFrame destinationFrame = BitmapFrame.Create(sourceDecoder.Frames[0],
            sourceDecoder.Frames[0].Thumbnail,
            newMetadata,
            sourceDecoder.Frames[0].ColorContexts);

        // Create a new in-memory JPG file
        JpegBitmapEncoder destinationEncoder = new JpegBitmapEncoder();
        destinationEncoder.Frames.Add(destinationFrame);

        // Open the destination file and save the jpg to it
        using (Stream destinationStream = File.Open(destinationFile, FileMode.Create, FileAccess.ReadWrite))
        {
            destinationEncoder.Save(destinationStream);
        }
    }
}

// Open the destination file and retrieve the metadata
BitmapMetadata bitmapMetadata = this.ReadMetadata("TestInput.jpg");

// Adding padding
this.AddMetadataPadding(bitmapMetadata, 5012);

// Change the title
bitmapMetadata.Title = "Test Title";

// Save the metadata into a new file, using the image from the original file
this.WriteMetadata("TestInput.jpg", "TestOutput.jpg", bitmapMetadata);