From http://www.esvapi.org/api#sample

new_gist_file

StringBuilder sUrl = new StringBuilder();
sUrl.Append("http://www.esvapi.org/v2/rest/passageQuery");
sUrl.Append("?key=IP");
sUrl.Append("&passage=" + Server.UrlEncode("Matthew 5").ToString());

sUrl.Append("&include-headings=true");

WebRequest oReq = WebRequest.Create(sUrl.ToString());
StreamReader sStream = new StreamReader(oReq.GetResponse().GetResponseStream());

StringBuilder sOut = new StringBuilder();
sOut.Append(sStream.ReadToEnd());
sStream.Close();

Response.Write(sOut.ToString());