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// For complete examples and data files, please go to https://github.com/groupdocsmetadata/GroupDocs_Metadata_NET
// initialize DocFormat
DocFormat docFormat = new DocFormat(Common.MapSourceFilePath(filePath));

// inspect document
InspectionResult inspectionResult = docFormat.InspectDocument();

// display comments
if (inspectionResult.Comments.Length > 0)
{
    Console.WriteLine("Comments in document:");
    foreach (DocComment comment in inspectionResult.Comments)
    {
        Console.WriteLine("Comment: {0}", comment.Text);
        Console.WriteLine("Author: {0}", comment.Author);
        Console.WriteLine("Date: {0}", comment.CreatedDate);
    }
}

// display merge fields
if (inspectionResult.Fields.Length > 0)
{
    Console.WriteLine("\nMerge Fields in document:");
    foreach (DocField field in inspectionResult.Fields)
    {
        Console.WriteLine(field.Name);
    }
}

// display hidden fields 
if (inspectionResult.HiddenText.Length > 0)
{
    Console.WriteLine("\nHiddent text in document:");
    foreach (string word in inspectionResult.HiddenText)
    {
        Console.WriteLine(word);
    }
}