(.NET Core C#) Fetch ISBN XML from isbndb.com and Parse

Demonstrates sending a query to isbndb.com and parsing the XML response.

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// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Http http = new Chilkat.Http();

// The access_key in this URL is a valid access key, but limited to 100 queries per day.
// If the key does not work, it may be that others were testing and exhausted the limit.
string strXml = http.QuickGetStr("http://isbndb.com/api/books.xml?access_key=OV8L2Y9I&results=details&index1=isbn&value1=0443074348");
if (http.LastMethodSuccess != true) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Chilkat.Xml xml = new Chilkat.Xml();
bool success = xml.LoadXml(strXml);

// The XML returned for this URL is the following:

// <?xml version="1.0" encoding="UTF-8" ?>

// <ISBNdb server_time="2007-10-25T14:07:25Z">
//     <BookList total_results="1" page_size="10" page_number="1" shown_results="1">
//         <BookData book_id="diagnostic_histopathology_of_tumors_2_volume_set_with_cd_rom" isbn="0443074348">
//             <Title>Diagnostic Histopathology of Tumors: 2-Volume Set with CD-ROMs</Title>
//             <TitleLong>Diagnostic Histopathology of Tumors: 2-Volume Set with CD-ROMs (Diagnostic Histopathology of Tumors (Fletcher))</TitleLong>
//             <AuthorsText>Christopher D. M. Fletcher (Editor)</AuthorsText>
//             <PublisherText publisher_id="churchill_livingstone">Churchill Livingstone</PublisherText>
//             <Details dewey_decimal="616" physical_description_text="2166 pages" language="" edition_info="Hardcover; 2007-03-13" dewey_decimal_normalized="616" lcc_number="" change_time="2006-12-13T14:53:42Z" price_time="2007-10-25T01:12:13Z" />
//         </BookData>
//     </BookList>
// </ISBNdb>

// First, navigate to the BookData node:
success = xml.FirstChild2();
success = xml.FirstChild2();

// Show the Title and AuthorsText:
Debug.WriteLine(xml.GetChildContent("Title"));
Debug.WriteLine(xml.GetChildContent("AuthorsText"));

// Show the publisher_id attribute of the PublisherText node:
Chilkat.Xml xml2 = null;
xml2 = xml.FindChild("PublisherText");
Debug.WriteLine(xml2.GetAttrValue("publisher_id"));

// Save the XML to a file:
success = xml.SaveXml("book.xml");