Change the Filename of an Attachment

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Demonstrates the Chilkat Email.SetAttachmentFilename method, which changes the filename of the attachment at a given zero-based index. This example adds an attachment and renames it, printing the filename before and after.

Background: The attachment filename is what a recipient sees and what most clients suggest when saving the file. Renaming it is handy when the original name is unclear, unsafe, or generic — for example giving a machine-generated tmp12345 a meaningful name like invoice.pdf before sending.

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bool success = false;

//  Demonstrates the SetAttachmentFilename method, which changes the filename of the
//  attachment at the given zero-based index.

Chilkat.Email email = new Chilkat.Email();
email.Subject = "Set attachment filename";

email.AddStringAttachment("oldname.txt","Some notes.");
Debug.WriteLine("Filename before: " + email.GetAttachmentFilename(0));

//  Change the filename of the first attachment (index 0).
success = email.SetAttachmentFilename(0,"newname.txt");
if (success == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

Debug.WriteLine("Filename after: " + email.GetAttachmentFilename(0));