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Discover a comprehensive guide on how to receive SMS using Twilio in ASP.NET WebForms, complete with code examples and explanations.
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Introduction

If you are working with Twilio and ASP.NET WebForms, you might have encountered a common challenge: receiving SMS replies. While Twilio has extensive documentation for ASP.NET MVC, specific guidance for WebForms is lacking. This post will walk you through the process of setting up your application to receive SMS messages using a generic HTTP handler.

The Challenge

You can send SMS messages without a hitch, but retrieving incoming messages can be a hurdle due to the following reasons:

Lack of clear documentation for ASP.NET WebForms from Twilio.

Confusion about how to set up a generic handler and where to tell Twilio to send the incoming messages.

Uncertainty about which URL to provide to the Twilio console for receiving replies.

In this guide, we'll address these issues step-by-step and clarify how to receive SMS messages from Twilio in your WebForms application.

Setting Up Your HTTP Handler

To receive SMS messages, you will need an HTTP handler that Twilio can call when a message is received. Here's how to create and set up your handler effectively.

Creating the Handler

Create a New Handler:
Start by creating a new handler file called message.ashx. This handler will handle incoming SMS requests from Twilio.

Implement the Handler:
Use the following code as your handler implementation:

[[See Video to Reveal this Text or Code Snippet]]

Breaking Down the Code

Content Type: We set the response content type to application/xml since Twilio expects a TwiML response.

Message Handling: The incoming SMS body is retrieved using context.Request.Form("Body") and is used to create a response.

Return Value: The response is sent back to Twilio using context.Response.Write(response.ToString()).

Configuring Twilio

Now that you have your handler ready, you need to provide Twilio with a URL so it can notify your application of incoming messages:

Determine the URL:
The URL you provide to Twilio should point to your handler. For example:

https://yourwebsite.com/message.ashx

Replace yourwebsite.com with your actual domain name.

Set Up in Twilio Console:
Go to your Twilio console and find the phone number you will be using. In the messaging settings, look for the section labeled "A MESSAGE COMES IN" and enter the URL you constructed.

Testing Your Setup

Once you have configured your Twilio number to use your handler URL:

Send a Test SMS:
From any phone, send a message to your Twilio number.

Check the Response:
If everything is set up correctly, Twilio will hit your handler, and you should receive a reply containing the text you sent.

Conclusion

Receiving SMS messages using Twilio in an ASP.NET WebForms application doesn't have to be complicated. With the right setup of an HTTP handler, you can effectively communicate with users via SMS.

By creating a handler like SmsHandler and correctly configuring your URL in the Twilio console, you can easily get started with receiving incoming SMS messages.

If you have any further questions, feel free to explore Twilio's documentation or leave a comment below!