Sendgrid-csharp: How do you set email priority?

[eat-sleep-code]

How do I set the message priority (i.e. make it marked urgent / high priority in Outlook, etc.)?

I tried (where "mailMessage" is SendGrid.Helpers.Mail.Mail object):

mailMessage.Headers.Add("Priority", "Urgent");
mailMessage.Headers.Add("Importance", "high");

It throws an Object reference not set to instance of an object error.

If I remove these two lines of code, the implementation works fine (albeit, now just a normal priority message) and the message is sent and received.

I am using the version currently deployed through Nuget (7.0.2.0 / 2.0.4.0 / 1.3.1.0).

[eat-sleep-code]

Figured it out, the following works...

mailMessage.AddHeader("Priority", "Urgent");
mailMessage.AddHeader("Importance", "high");

[thinkingserious]

Thanks for sharing your solution @eat-sleep-code!

[samyaktelsang]

Thanks @eat-sleep-code . Had the same issue.