ASP.NET Code running on AppHarbor for Twilio Rube Goldberg Contest

answer-nixie-tubes.cshtml

@using System.Text.RegularExpressions;
@{
    Response.ContentType = "text/xml";
 
    // My Twilio phone number
    string callerId = "+XXXXXXXXXX"; 
 
    // put your default Twilio Client name here, for when a phone number isn't given
    string number   = "jenny";
 
    // get the phone number from the page request parameters, if given
    if (Request["PhoneNumber"] != null) {
        number = Request["PhoneNumber"];
    }

}
<?xml version="1.0" encoding="UTF-8"?>
<Response>

    <Sms to="@number" from="@callerId">
        Hi can you tell me what year it is?
    </Sms>

    <Say>
        I just sent a text message to @number .
        If they reply with a number, we'll set the nixie tubes!
    </Say>

</Response>