Is there a clean way to create a byte[] from an HttpWebRequest.Read?

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The following code-snippet works but is just not elegant, IMO.

Does anyone have a recommendation to make this more efficient?

For example, I prefer NOT to have a static "buf" size. In fact, I would
prefer something similar to StreamReader.ReadToEnd() for returning a string,
but into a byte[] array.

Snippet:

HttpWebResponse webResponse = (HttpWebResponse) webRequest.GetResponse();
using (BinaryReader reader = new
BinaryReader(webResponse.GetResponseStream(), enc))
{
byte[] buf = new byte[20000];
int count = reader.Read(buf, 0, buf.Length);
byte[] resp = new byte[count];
for (int i = 0; i < count; i++) resp [i] = buf[i];
}


.