Hi guys, i am having trouble deleting a file after sending an email.
The file is in use.

Here's the code:

       String texto = "Test";
       System.Net.Mail.SmtpClient smtp = new
System.Net.Mail.SmtpClient();
       System.Net.Mail.MailMessage correo = new
System.Net.Mail.MailMessage();
       correo.To.Add("test@test.com");
       correo.Body = texto;
       correo.IsBodyHtml = false;
       string pdf="file.pdf";
       correo.Attachments.Add(new
System.Net.Mail.Attachment(Server.MapPath(pdf)));
       try
       {
           smtp.Send(correo);
       }
       catch (Exception)
       {
       }
       finally{
            File.Delete(pdf);
       }

I have searched on the web and everyone seems to be doing it the same
way. I dont know if this is relevant, but i am creating that file from
itextsharp, a port of itext to c#, which reads a pdf form and saves it
to a new file, which is the one being attached. The pdf file (called a
"stamper") is being closed before the redirect to the email page
happens. And the email is sent succesfully with the attached file if i
don't delete it.