This code works fine for displaying the content of a XML in IE, Firefox and Chrome:

        Response.Clear()
        Response.Buffer = True
        Response.Charset = ""
        Response.Cache.SetCacheability(HttpCacheability.NoCache)
        Response.ContentType = "application/xml"
        Response.Write("<?xml version=""1.0""?><test>Test</test>")
        Response.Flush()
        Response.End()

But, Safari does not want to show it properly. It only show the inner XML and does not understand application/xml. I tried text/xml. This was not any better. Anyone has an idea?