How to call httpClient with using

[sapator]

I'm translating a console vb app and I'm stuck here:

Using client As New HttpClient()

end using

I'm trying every combination and it does not seem to compile:

using (var client = new HttpClient())
{
}

using (client = new HttpClient())
{
}

 using  var client = new HttpClient();

This will work but does not implement using:

 HttpClient client = new HttpClient();

So how does this compile?
Thanks.