DocumentParsingCSharpNew.cs

// Create an instance of Parser class
using (Parser parser = new Parser(filePath))
{
    // Extract text to the reader
    using (TextReader reader = parser.GetText())
    {
        // Check if text extraction is supported
        if (reader == null)
        {
            Console.WriteLine("Text extraction isn't supported.");
            return;
        }
        string textLine = null;
        do
        {
            textLine = reader.ReadLine();
            if (textLine != null)
            {
                Console.WriteLine(textLine);
            }
        }
        while (textLine != null);
    }
}

DocumentParsingCSharpOld.cs

// Create an extractor factory
ExtractorFactory factory = new ExtractorFactory();
// Create a text extractor
using (TextExtractor extractor = factory.CreateTextExtractor(filePath))
{
    // Extract text from the text extractor
    string textLine = null;
    do
    {
        textLine = extractor.ExtractLine();
        if (textLine != null)
        {
            Console.WriteLine(textLine);
        }
    }
    while (textLine != null);
}