public static void Run()
{
// ExStart:AddChildNode
// ExFor:Notebook
// ExFor:Document
// ExSummary:Shows how to add new section to a notebook.
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_NoteBook();
// Load a OneNote Notebook
var notebook = new Notebook(dataDir + "Notizbuch öffnen.onetoc2");
// Append a new child to the Notebook
notebook.AppendChild(new Document(dataDir + "Neuer Abschnitt 1.one"));
dataDir = dataDir + "AddChildNode_out.onetoc2";
// Save the Notebook
notebook.Save(dataDir);
// ExEnd:AddChildNode
Console.WriteLine("\nChild node added successfully.\nFile saved at " + dataDir);
}