Example [MailMessage.AlternateViews Property ]

ExampleAlternatingView.cs

MailMessage mailMsg = new MailMessage();
            
// To
mailMsg.To.Add(new MailAddress("to@example.com", "To Name"));
// From
mailMsg.From = new MailAddress("from@example.com", "From Name");
// Subject
mailMsg.Subject = "subject";
            
//Texto
string text = "text body";
//Html
string html = @"<p>html body</p>";

//View Texto
mailMsg.AlternateViews.Add(
    AlternateView.CreateAlternateViewFromString
    (text, null, MediaTypeNames.Text.Plain));
//View Html
mailMsg.AlternateViews.Add(
    AlternateView.CreateAlternateViewFromString
    (html, null, MediaTypeNames.Text.Html));

//Send
SmtpClient smtpClient = new SmtpClient();
smtpClient.Send(mailMsg);