c# - delete attachment file

Question

i am using System.Net.Mail for sending mail in asp.net.. how to delete attachment file after it is send as attachment mail.. i tried to use File.Delete method.. but i am getting this error.. the process cannot access the file pathfun.jpg' because it is being used by another process. thank you

Answer 1

Dispose of the MailMessage when you're done with it. It still has a lock on the file you've added as an attachment until you've done so.

var filePath = "C:\path\to\file.txt";
var smtpClient = new SmtpClient("mailhost");
using (var message = new MailMessage())
{
    message.To.Add("to@domain.com");
    message.From = new MailAddress("from@domain.com");
    message.Subject = "Test";
    message.SubjectEncoding = Encoding.UTF8;
    message.Body = "Test " + DateTime.Now;
    message.Attachments.Add(new Attachment(filePath));
}
if (File.Exists(filePath)) File.Delete(filePath);
Console.WriteLine(File.Exists(filePath));

Output: False

I would imagine that if you still have something locking the file after disposing the message, that you likely have another lock on the file, but without code, we can't help you.