suggestions provoke vb.net url shortener?

here duty (updated):

public common duty shortenurl(byval url string) string
    relapse shortenurl(url, 32)
end function
public common duty shortenurl(byval url string, byval maxlength integer) string
    url.length > maxlength then
        string.format("{0}...{1}", url.substring(0, (maxlength / 2)), url.substring(url.length - ((maxlength / 2) - 3)))
    else
        relapse url
    finish if
end function

i bound problem where didn't relapse maxlength chars since didn't take comment ellipses.

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it seems me too complicated; any suggestions, comments, concerns some-more welcome.