How do I get NAnt to use the new VB9 compiler for .NET 2.0 applications?

Public Class SomeObject
    Public Name As String
End Class
Private SomeList As List(Of SomeObject) = SomeObject.GetAllSomeObjects()
Public Function FindFirstItemWithSimilarName(ByVal x As String) As SomeObject
    Return SomeList.Find(Function(p As SomeObject) p.Name.Contains(x))
End Function

<property name="nant.settings.currentframework" value="net-2.0"/>

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;

namespace MSBuild
{
    public class Program
    {
        public static int Main(string[] args)
        {
            for (int argIndex = 0; argIndex < args.Length; argIndex++)
            {
                if (args[argIndex].Contains(" "))
                {
                    string quotedArg = string.Format(""{0}"", args[argIndex]);
                    args[argIndex] = quotedArg;
                }
            }

            string arguments = string.Join(" ", args);

            // HACK: I should probably change
            //       this to automaticlaly
            //       determine the path

            Process process = Process.Start("C:\WINDOWS\Microsoft.NET\Framework\v3.5\MSBuild.exe",arguments);

            process.WaitForExit();

            return process.ExitCode;

        }
    }
}

<property name="nant.settings.currentframework" value="net-3.5"/>