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// For complete examples and data files, please go to https://github.com/groupdocs-annotation/GroupDocs.Annotation-for-.NET
// Create instance of annotator. 
AnnotationConfig cfg = CommonUtilities.GetConfiguration();

AnnotationImageHandler annotator = new AnnotationImageHandler(cfg);

IDocumentDataHandler documentRepository = annotator.GetDocumentDataHandler();
if (!Directory.Exists(cfg.StoragePath))
{
    Directory.CreateDirectory(cfg.StoragePath);
} 

Stream result = annotator.ExportAnnotationsToDocument(inputFile, annotations, DocumentType.Pdf);

// Save result stream to file.
using (FileStream fileStream = new FileStream(MapDestinationFilePath("Annotated.pdf"), FileMode.Create))
{
    byte[] buffer = new byte[result.Length];
    result.Seek(0, SeekOrigin.Begin);
    result.Read(buffer, 0, buffer.Length);
    fileStream.Write(buffer, 0, buffer.Length);
    fileStream.Close();
}