What's the right way to name an email attachment in .NET?

Question

There are 3 "name" properties on the .NET Attachment class:

Attachment.Name Attachment.ContentType.Name Attachment.ContentDisposition.FileName

I want to send an excel file with the name "foo.xls". Which of these should be set? What's the difference? The docs are not particularly illuminating.

Answer 1

The correct one to use is Attachment.Name.

Info for Attachment.ContentType.Name -

When specifying content for a Attachment as a Stream or String, you can use Name to set the name of the file that stores the content on the recipient's system

Info for Attachment.ContentDisposition.FileName -

The FileName property allows the sender to suggest the name to be used to store an e-mail attachment on the recipient's computer. This name is a suggestion only; the receiving system can ignore it. The name must not include path information; any such information is ignored by the receiving computer.