Attachment.CreateAttachmentFromString Method (String, String)
Creates a mail attachment using the content from the specified string, and the specified MIME content type name.
Assembly: System (in System.dll)
The MIME content type name value in the content type associated with this attachment.
If the content is in ASCII format then the character encoding is set to ASCII. For all other formats, the character encoding is set to utf-8. The default media type is plain text.
If the content is not in ASCII format and the encoding is null, utf-8 encoding is used.
Available since 2.0