File is already using by another process...

Question

Hi friends,

I am one problem. Please help me to sort out this.

I am send email with attachments. It is working fine.

I want to do is that, after sending the mail, I want to move the files which i attached to the mail from it's original location to other location in my hard drive. 

But When I am doing this, It gives me the exception "File is already in use by another process"

Code:

SendMessageWithAttachment() this method actually send the mail.

 public static string SendMessageWithAttachment(string sendTo, string sendFrom, string sendSubject, string sendMessage, ArrayList attachments)
        {
            try
            {
                message = new MailMessage(
                   sendFrom,
                   sendTo,
                   sendSubject,
                   sendMessage);
                
                foreach (string attach in attachments)
                {
                    Attachment attached = new Attachment(attach, MediaTypeNames.Application.Octet);
                    message.Attachments.Add(attached);
                }
               
                client = new SmtpClient(Properties.Settings.Default.SMTPAddress);

                NetworkCredential basicAuthentication = new NetworkCredential(Properties.Settings.Default.Username, Properties.Settings.Default.Password);
                client.EnableSsl = true;
                client.Port = Convert.ToInt32(Properties.Settings.Default.Port);
                client.UseDefaultCredentials = false;
                client.Credentials = basicAuthentication;
                // send message
                client.Send(message);                 
                
                return "Message sent to " + sendTo + " at " + DateTime.Now.ToString() + ".";
            }
            catch (Exception ex)
            {
                return ex.Message.ToString();               
            }
        }

Here I am invoking the above method

 ArrayList sendAttachments = new ArrayList(Directory.GetFiles("InProcess Mails"));

 

string status = Emailer.SendMessageWithAttachment(sendTo, sendFrom, sendSubject, sendMsgBody, sendAttachments);
            
 MessageBox.Show(status, "Email Status");
 foreach (string str in sendAttachments)
 {
        File.Move(str, "SentMail\\" + str.Substring(str.LastIndexOf('\\')));    <--- This is the line where exception is through
 }
            

Please solve my this problem.

Thanks & regards,

Manesh