using System;
using System.Text;
using System.Xml;
using System.Xml.Serialization;

public class Example
{
    public String Name { get; set; }

    static void Main()
    {
        Example example = new Example { Name = "Foo" };

        XmlSerializer serializer = new XmlSerializer(typeof(Example));

        XmlSerializerNamespaces emptyNamespace = new XmlSerializerNamespaces();
        emptyNamespace.Add(String.Empty,String.Empty);

        StringBuilder output = new StringBuilder();

        XmlWriter writer = XmlWriter.Create(output,new XmlWriterSettings { OmitXmlDeclaration = true });
        serializer.Serialize(writer,example,emptyNamespace);

        Console.WriteLine(output.ToString());
    }
}