using System;

using System.Xml;

​

public class Program

{

    public static void Main()

    {

        using (var writer = XmlWriter.Create(Console.Out))

        {

            writer.WriteStartElement("root");

            writer.WriteStartElement("child");

            writer.WriteWhitespace("\n");

            writer.WriteStartElement("child-on-new-line");          

            writer.WriteString("content");          

            writer.WriteEndElement();

            writer.WriteEndElement();

            writer.WriteEndElement();

        }

    }

}