How do I write an XSLT to transform XML to CSV?

Question

I'm trying to write an XSLT that will transform an XML document that I have to a CSV file. Here's a sample of the XML:

<?xml version="1.0" encoding="utf-8"?>
<Import>
    <Users>
        <User ID="user_1" EmailAddress="[email protected]">
            <Contact FirstName="John" LastName="Doe" />
            <Address Street1="808 Elm St" City="Anywhere" State="NY" />
        </User>

        <User ID="user_2" EmailAddress="[email protected]">
            <Contact FirstName="Jane" LastName="Noone" />
            <Address Street1="123 Some Rd" City="Anywhere" State="NY" />
        </User>     
    </Users>
</Import>

What I want is an XSLT that will output like so:

John,Doe,808 Elm St,Anywhere,NY
Jane,Noone,123 Some Rd,Anywhere,NY

I think I have the C# code correct to initiate the transform, but just in case I don't, here's that code as well:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Xsl;
using System.Configuration;

namespace UserTransform
{
    class Program
    {
        static void Main(string[] args)
        {
            string oldXML = ConfigurationSettings.AppSettings["XMLToBeTransformed"];
            string xsltLocation = ConfigurationSettings.AppSettings["XSLTfile"];
            string newCSV = ConfigurationSettings.AppSettings["NewCSVLocation"];

            XslCompiledTransform transform = new XslCompiledTransform();
            transform.Load(xsltLocation);
            transform.Transform(oldXML, newCSV);
        }
    }
}