public void AddAttachment(string fileName, byte[] data, string mimeType, string contentId)
{
var emailAttachment = new EmailAttachment(fileName, data, mimeType, true);
emailAttachment.ContentID = contentId;
this.Attachments.Add(emailAttachment);
}
public string AddAttachment(string fileName, byte[] data, string mimeType, bool isInline = false)
{
var emailAttachment = new EmailAttachment(fileName, data, mimeType, isInline);
this.Attachments.Add(emailAttachment);
return emailAttachment.ContentID;
}