title: Twilio SMS sandbox using C#
body: <p>How do you use the Twilio sandbox mode with C#?  I have a ashx.cs file that I am using to write my code. Would I put it there?  If so, what does that look like?<br>
  There is no real great examples on their website on how to do this except for CURL and Ruby.  </p>
  
  <p>We are using TwiML to general an XML file tha t parses our data to send back and forth to the Twilio service.  We don't want to be charged every time we send a test text message. 
  How would we set the Sandbox up so we could do some testing.<br>
  I found the Test auth Token and account Sid, but how do I use those?
  We don't have them in our current application and we are specifying our .ashx page in Twilio to process our code.</p>
  
  <p>Thanks in advance.</p>