Attachment not being sent with email

Email is working when form is submitted, but the attachment is not being sent with it.. what im i doing wrong with the logic below: Also, would it be possible to add an attachment without uploading it to the server first?
if (Attach_Files.PostedFile != null) { /* Get a reference to PostedFile object */ HttpPostedFile attFile = Attach_Files.PostedFile; /* Get size of the file */ int attachFileLength = attFile.ContentLength; /* Make sure the size of the file is > 0 */ if (attachFileLength > 0) { /* Get the file name */ string strFileName = Path.GetFileName(Attach_Files.PostedFile.FileName); /* Save the file on the server */ Attach_Files.PostedFile.SaveAs(Request.PhysicalApplicationPath + "tempAttach" + strFileName); /* Create the email at ...