Emad Ibrahim

public static string Serialize(this object obj)
{
    string XmlString = String.Empty;
    using (var memStream = new MemoryStream())
    {
        var serializer = new XmlSerializer(obj.GetType(), string.Empty);
        using (var xmlText = new XmlTextWriter(memStream, Encoding.Default))
        {
            serializer.Serialize(xmlText, obj);
        }
        XmlString = Encoding.Default.GetString(memStream.ToArray());
        memStream.Close();
    }
    return XmlString;
}

<?xml version="1.0" encoding="Windows-1252"?>
<ZipContentInfo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <FileName>00107_tokyoatnight_1680x1050.jpg</FileName>
    <FileSize>281268</FileSize>
</ZipContentInfo>

public static string Serialize(this object obj)
{
    var ser = new XmlSerializer(obj.GetType());
    using (var tw = new StringWriter())
    {
        using (var xw = XmlWriter.Create(tw, new XmlWriterSettings() { OmitXmlDeclaration = true }))
        {
            var ns = new XmlSerializerNamespaces();
            //Add an empty namespace and empty value
            ns.Add("", "");
            ser.Serialize(xw, obj, ns);
            return tw.ToString();
        }
    }
}

<ZipContentInfo>
    <FileName>00107_tokyoatnight_1680x1050.jpg</FileName>
    <FileSize>281268</FileSize>
</ZipContentInfo>