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using (Signature signature = new Signature("signed.pdf"))
{
    // set up search options: default options return all metadata signatures of the document
    MetadataSearchOptions searchOptions = new MetadataSearchOptions();
    // search for signatures in document
    List<PdfMetadataSignature> signatures = signature.Search<PdfMetadataSignature>(searchOptions);
    // try to get each Pdf signature with proper data type added in Basic usage example SignPdfWithMetadata
    PdfMetadataSignature mdSignature;
    // See example SignPdfWithMetadata with added various data type values to signatures
    try
    {
        mdSignature = signatures.FirstOrDefault(p => p.Name == "Author");
        Console.WriteLine($"\t[{mdSignature.Name}] as String = {mdSignature.ToString()}");
        mdSignature = signatures.FirstOrDefault(p => p.Name == "CreatedOn");
        Console.WriteLine($"\t[{mdSignature.Name}] as DateTime = {mdSignature.ToDateTime().ToShortDateString()}");
        mdSignature = signatures.FirstOrDefault(p => p.Name == "DocumentId");
        Console.WriteLine($"\t[{mdSignature.Name}] as Integer = {mdSignature.ToInteger()}");
        mdSignature = signatures.FirstOrDefault(p => p.Name == "SignatureId");
        Console.WriteLine($"\t[{mdSignature.Name}] as Double = {mdSignature.ToDouble()}");
        mdSignature = signatures.FirstOrDefault(p => p.Name == "Amount");
        Console.WriteLine($"\t[{mdSignature.Name}] as Decimal = {mdSignature.ToDecimal()}");
        mdSignature = signatures.FirstOrDefault(p => p.Name == "Total");
        Console.WriteLine($"\t[{mdSignature.Name}] as Float = {mdSignature.ToSingle()}");
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error obtaining signature: {ex.Message}");
    }

    // narrow the search down to metadata signatures whose names end with "Id"
    MetadataSearchOptions filteredOptions = new MetadataSearchOptions
    {
        Name = "Id",
        NameMatchType = TextMatchType.EndsWith
    };
    List<PdfMetadataSignature> filteredSignatures = signature.Search<PdfMetadataSignature>(filteredOptions);
    Console.WriteLine($"Found {filteredSignatures.Count} metadata signature(s) with name ending with 'Id'");
}