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The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications
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Code you write will be very specific to your application.
Hint: Webhooks are better, as they fire asynchronously. If you try checking status of even a few 1000s of email addresses, time for calls will be long + if you attempt calls to frequently, likely SendGrid rate limits will kick in.
https://sendgrid.com/docs/
Likely best to hire someone to provide you with a working solution for your specific application.
https://github.com/sendgri