vb.net check if video streaming is online

H i experts, vb noob here.
my question:
i need to check some video streaming urls from a text file
what y tried:

 Dim request = DirectCast(WebRequest.Create _
           (STREAMING_URLS_TEXT), WebRequest)

        Try
            Dim response As WebResponse = DirectCast(request.GetResponse(), WebResponse)
            MsgBox("exist")
        Catch ex As WebException
            Dim response As WebResponse = DirectCast(ex.Response, WebResponse)
            MsgBox("no exist")
        End Try

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but the method avobe only checks if the server responds or if the file exists, and what I want is to check if the streaming is working.
any ideas?
thanks in advance any help would be appreciated.