How to send email contains an image without saving image as a file?

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I'm developing a system that can send a QR Code image to a member via e-mail. I want to build it in a Web Service for usage of many clients. The current method I use is saving the QR Code to be a real image file, and attaching it when sending e-mail, but failed when I use it on web service. The message says some error occurred on GDI+.
I've searched on Google with some keywords C#, e-mail, and image. Many of the first searched results are teaching the way with attaching image with image file name. How can I e-mail to someone with image but no need to save it as a file?

What I have tried:

Google with some keywords C#, e-mail, and image

Posted 4-Sep-16 21:25pm

Momoko Asahina 708H

Updated 4-Sep-16 21:53pm

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OriginalGriff · Answer 1 · 2016-09-04T21:53:00

Convert it to a Base64 string and embed it, or use it as a CID: Embedding Images in Your Emails. The Facts. | SendGrid[^]
But...it still isn't going to show in many cases: there is no system which will guarantee that images are displayed in all email clients. The best approach is to provide a "click here" link to the image via a webpage if the user really needs it and it isn't displayed.