Serialize Object to XML in with specific format

Answer 1

There is also LINQtoXSD (not XmlSerializer, sure :-)

Answer 2

Ok guys i just found the answer here to my questions and im writing here to help people with this problem:

    public static string SerializeToXMLString(object ObjectToSerialize)
        {
            //
            XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
            ns.Add("ns", "http://example.uri.here");
            //
            //
            XmlSerializer serializer = new XmlSerializer(ObjectToSerialize.GetType());
            XmlWriterSettings writerSettings = new XmlWriterSettings();
            writerSettings.OmitXmlDeclaration = true;
            StringWriter stringWriter = new StringWriter();
            using (XmlWriter xmlWriter = XmlWriter.Create(stringWriter, writerSettings))
            {
                serializer.Serialize(xmlWriter, ObjectToSerialize,ns);
            }
            return  stringWriter.ToString();
}

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To solve the prefix : I created a XmlSerializerNamespaces object and added the prefix that I wanted and the namespace.

To solve the ns:pay ns:payment I created two classes: Payment and Pay.

In the pay class i added this: [XmlRoot("pay", Namespace = "http://example.uri.here")]

In the Payment Class i added this: [XmlRoot("pay")]

Pay Class has a property of type payment. That create the xml in this style:

<ns:pay>
<ns:payment
element here
</ns:payemnt>
</ns:pay>

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Thank you guys. Sorry that I ask and found the question almost 30 minutes after asking.