.Net Core how to show display name instead of Email address?

Question

I've built an email service using SMTP (System.net.mail nuget package) which also sends out text messages. When I send an email it shows the display name using the following technic:

MailAddress from = new MailAddress("[email protected]", "DisplayName");

But while sending text messages it doesn't work. It shows the entire email address instead of the display name. Attached is the snapshot for reference. enter image description here