CLOSE_WAIT problem with HttpWebRequest

Question

I have an application that simultaneously connects to many websites and uploads large files via http.

When I test the system with TcpView, CLOSE_WAITthere are many connections in the state . My code looks something like this:

try
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
}
catch
{
    if (response != null)
        response.Close();
}

Stream stream = Response.GetResponseStream();

// read stream until an error happens or we reach end of stream. Then:

if (request != null)
    request.Abort();

if (response != null)
    response.Close();

Why am I still able to make many connections CLOSE_WAIT?