attempting to create an objectDataSource for files

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I'm attempting to create an objectdatasource of the most simple kind to just
return a list of file names tobe bound to a grid view

basicly i want to just list the file names from a directory with mp3 as the
extention.
the class i have created is as follows: and it is very incomplete

Imports Microsoft.VisualBasic
Imports System.IO
Public Class RadioShowFunctions
Private _szFileName As String

#Region "Database fields as properties"
Public Property szFileName() As String
Get
Return _szFileName
End Get
Set(ByVal value As String)
_szFileName = value
End Set

End Property
#END Region

Public Function fn_getallRadioShows() As DirectoryInfo
Dim ri As System.IO.DirectoryInfo = New
System.IO.DirectoryInfo("c:\websites\arlnewlook\radioshows")
Return ri
End Function
Public Function fn_getRadioShowsDS() As Array
Dim ary As Array = Me.fn_getallRadioShows.GetFiles("*.mp3")
' System.Web.HttpContext.Current.Response.Write(ary.Length.ToString)
Return ary
End Function
End Class

how can i get fn_getRadioShowsDS to return a list of type ObjectDataSource.