using System;
using System.Xml;
 
public class Test
{
	public static void Main()
	{
		var id = 3;
		var message = "&'<crazyMessage&&";
 
		var xmlDoc = new XmlDocument();
 
		using(var writer = xmlDoc.CreateNavigator().AppendChild())
		{
			writer.WriteStartElement("ROOT");
 
			writer.WriteElementString("ID", id.ToString());
 
			writer.WriteStartElement("INPUT");
			writer.WriteElementString("ENGMSG", message);
			writer.WriteEndElement(); // INPUT
 
			writer.WriteEndElement(); // ROOT
		}
 
		var xmlString = xmlDoc.InnerXml;
		Console.WriteLine(xmlString);
	}
}

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