How to mock HttpWebRequest webservice using Rhino mocking in c#

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ASP.NET

C#5.0

MVC5

Hello all,

I have a function for converting currency. like

public decimal ExchangeRate()
{
HttpWebRequest request;
HttpWebResponse response;
decimal rate=0;
string completeUrl = string.Format("www.exchangecurrency.com", "INR", "EUR");
request = (HttpWebRequest)WebRequest.Create(completeUrl);
response = (HttpWebResponse)request.GetResponse();
var reader = new StreamReader(response.GetResponseStream());
string json_result = reader.ReadToEnd();
decimal.TryParse(json_result, out rate);
return rate;
}

Now I want writing a test using Rhino mocking.
How I do this Thanks in advance.