(C#) Traverse Direct Children via FirstChild / NextSibling, or LastChild / PreviousSibling

Demonstrates some ways to iterate over direct child nodes using the FirstChild / NextSibling and LastChild / PreviousSibling methods.

The input XML, available at http://www.chilkatsoft.com/data/fruit.xml, is this:

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

Download: Chilkat .NET Assemblies

Chilkat.Xml xml = new Chilkat.Xml();
Chilkat.Xml child = null;
Chilkat.Xml nextSibling = null;
Chilkat.Xml prevSibling = null;

bool success;
//  The sample input XML is available at http://www.chilkatsoft.com/data/fruit.xml
success = xml.LoadXmlFile("fruit.xml");
if (success != true) {
    textBox1.Text += xml.LastErrorText + "\r\n";
    return;
}

//  Iterate over the direct children by using FirstChild / NextSibling
child = xml.FirstChild();
while (!(child == null )) {
    textBox1.Text += child.Tag + " : "
         + child.Content + "\r\n";
    nextSibling = child.NextSibling();

    child = nextSibling;
}

textBox1.Text += "-----" + "\r\n";

//  Do the same, but with FirstChild2 / NextSibling2 to avoid
//  creating so many XML object instances:
success = xml.FirstChild2();
while (success == true) {
    textBox1.Text += xml.Tag + " : " + xml.Content + "\r\n";
    success = xml.NextSibling2();
}

//  Revert back up to the parent:
xml.GetParent2();

textBox1.Text += "-----" + "\r\n";

//  Iterate in reverse order using LastChild / PreviousSibling
child = xml.LastChild();
while (!(child == null )) {
    textBox1.Text += child.Tag + " : "
         + child.Content + "\r\n";
    prevSibling = child.PreviousSibling();

    child = prevSibling;
}

textBox1.Text += "-----" + "\r\n";

//  Do the same, but with LastChild2 / PreviousSibling2 to avoid
//  creating so many XML object instances:
success = xml.LastChild2();
while (success == true) {
    textBox1.Text += xml.Tag + " : " + xml.Content + "\r\n";
    success = xml.PreviousSibling2();
}

//  Revert back up to the parent:
xml.GetParent2();