Sending an email with attachment using SendGrid

Question

 var myMessage = new SendGridMessage();
            myMessage.From = new MailAddress("[email protected]");
            myMessage.AddTo("Cristian <[email protected]>");
            myMessage.Subject = user.CompanyName + "has selected you!";
            myMessage.Html = "<p>Hello World!</p>";
            myMessage.Text = "Hello World plain text!";

           // myMessage.AddAttachment("C:\test\test.txt");



            var apiKey = "";
            var transportWeb = new Web(apiKey);
            transportWeb.DeliverAsync(myMessage);

Basically I can make the email work, and the moment I attempt to add an attachment it doesn't send it. I tried different paths and different ways of writing the path, I am not sure what is going wrong, every single tutorial I have found shows it should work like this.

Answer 1

I got it to work, turns out I just needed a virtual path:

myMessage.AddAttachment(Server.MapPath(@"~\img\logo.png"));