Reading XML from REST API

I am writing a small console application in C# to send a request to REST API and receive the response in XML. below is my code

 using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
            {
                StreamReader reader = new StreamReader(response.GetResponseStream());
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(reader.ReadToEnd());
                Console.Write(xmlDoc);

            } 

I have checked using the fiddler and i am getting 200 response code and result. but while doing xmlDoc.Load(reader.ReadToEnd()); i am getting error.

Can any one help me to solve this? or is there any other way to do this.

I want to write the response XML result into file.

Thanks in advance