File Upload is not working properly in Safari Browser

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C#

ASP.NET

I have one asp.net page for sending files as an attachment.
I am selecting multiple files using file upload control and saving it in one folder and from that folder i m sending that files as an attachment with a mail.
This is working fine on google chrome and IE but on "Safari" browser files are getting copied with "0" byte size. If we are selected 1 single file as an attachment then its working fine in all the browsers.

Thanks in advance.

Code of Send Button

using (MailMessage mailMessage = new MailMessage())
                {
                    mailMessage.From = new MailAddress("myname@domain.com");
                    mailMessage.Subject = txtSubject.Text.Trim();
                    mailMessage.Body = txtMessage.Text.Trim();
                    mailMessage.IsBodyHtml = true;
                    mailMessage.To.Add(new MailAddress(txtTo.Text.Trim()));


                    // Copy all seleted files to "EmailFiles" folder for sending as an attachment to mail.

                    if (FileUpload1.HasFile || FileUpload1.FileName !="")
                    {
                        foreach (HttpPostedFile uploadedFile in FileUpload1.PostedFiles)
                        {
                            uploadedFile.SaveAs(System.IO.Path.Combine(Server.MapPath("~/EmailFiles/"), uploadedFile.FileName));                        
                        }
                    }
                    // Encrypt files

                    string encryptFilePath = Request.PhysicalApplicationPath + "EmailFiles\\";
                    string[] S2 = Directory.GetFiles(encryptFilePath);
                    foreach (string fileName in S2)
                    {
                        encryptFiles(fileName);
                    }
                    
                    // looping through all the files to send files as an attachment.
                    string UplodedfilesForEmail = Request.PhysicalApplicationPath + "EmailFiles\\";
                    string[] S1 = Directory.GetFiles(UplodedfilesForEmail);
                    foreach (string fileName in S1)
                    {
                        mailMessage.Attachments.Add(new Attachment(fileName));
                    }
                                        
                    SmtpClient smtp = new SmtpClient();
                    smtp.Host = "mail.domain.com";
                    smtp.EnableSsl = true;
                    System.Net.NetworkCredential NetworkCred = new System.Net.NetworkCredential("emailID", "<password>");
                    NetworkCred.UserName = mailMessage.From.Address;
                    NetworkCred.Password = "<password>";
                    smtp.UseDefaultCredentials = true;
                    smtp.Credentials = NetworkCred;
                    ServicePointManager.ServerCertificateValidationCallback = delegate(object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
                    { return true; };
                    smtp.Port = 25;
                    smtp.Send(mailMessage);
                }