SearchImageSignatureInDocuments.cs

using (Signature signature = new Signature(sample.pdf))
{
    // setup search options
    ImageSearchOptions searchOptions = new ImageSearchOptions()
    {
        // specify special pages to search on 
        AllPages = false,
        // single page number
        PageNumber = 1,
        // setup extended search in pages setup
        PagesSetup = new PagesSetup() { FirstPage = true, LastPage = true, OddPages = false, EvenPages = false }
    };
 
    // search document
    List<ImageSignature> signatures = signature.Search<ImageSignature>(searchOptions);
 
    // output signatures
    foreach (ImageSignature imageSignature in signatures)
    {                 
        if (imageSignature != null)
        {
            Console.Write($"Found Image signature with size {imageSignature.Size}.");
            Console.WriteLine($"Location at {imageSignature.Left}-{imageSignature.Top}. Size is {imageSignature.Width}x{imageSignature.Height}.");
        }
    }
}

SearchTextSignatureInDocuments.cs

using (Signature signature = new Signature(sample.pdf))
{
    // setup search options
    TextSearchOptions searchOptions = new TextSearchOptions()
    {
        // specify special pages to search on 
        AllPages = false,
        // single page number
        PageNumber = 1,
        // setup extended search in pages setup
        PagesSetup = new PagesSetup() { FirstPage = true, LastPage = true, OddPages = false, EvenPages = false },
        // specify text match type
        MatchType = TextMatchType.Exact,
        // specify text pattern to search
        Text = "John Smith"
    };
 
    // search document
    List<TextSignature> signatures = signature.Search<TextSignature>(searchOptions);
 
    // output signatures
    foreach (TextSignature textSignature in signatures)
    {
        if (textSignature != null)
        {
            Console.Write($"Found Text signature: {textSignature.SignatureImplementation} with text {textSignature.Text}.");
            Console.WriteLine($"Location at {textSignature.Left}-{textSignature.Top}. Size is {textSignature.Width}x{textSignature.Height}.");
        }
    }
}