Why i can't send mail from local and server both side

protected void getDataforemail(int invitationID)
      {

          try
          {
              EventManagerDataContext db = new EventManagerDataContext();

              {
                  var q = (from a in db.EMR_EVENTs
                           join b in db.EMR_CLIENTs on a.ClientID equals b.ClientID
                           join c in db.EMR_INVITATIONs on a.EventID equals c.EventID

                           where c.InvitationID == invitationID

                           select new
                           {
                               EventID = a.EventID,
                               Client_Name = b.Name,
                               Event_Name = a.Name,
                               Activation_Code = c.Activation_Code

                           });

                  var ev = q.FirstOrDefault();

                  StreamReader reader = new StreamReader(Server.MapPath("~/HTMLPage1.htm"));
                  string readFile = reader.ReadToEnd();
                  string myString = "";
                  myString = readFile;



                  MailAddress fromMail = new MailAddress("ketanitaliya16@gmail.com");

                  Msg.CC.Add(new MailAddress(clientEmail(getClientId(lblclientname.Text))));


                  myString = myString.Replace("$$Client_Name$$", ev.Client_Name);
                  myString = myString.Replace("$$Event_Name$$", ev.Event_Name);
                  myString = myString.Replace("$$Activation Code$$", ev.Activation_Code);

                  Msg.From = fromMail;


                  // Subject of e-mail
                  Msg.Subject = "Send Mail with HTML File";
                  Msg.Body = myString.ToString();
                  Msg.IsBodyHtml = true;






                  var smtp = new System.Net.Mail.SmtpClient();
                  {
                      smtp.Host = "smtp.gmail.com";
                      smtp.Port = 587;
                      smtp.EnableSsl = true;


                     smtp.UseDefaultCredentials = false;
                      smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                      smtp.Credentials = new NetworkCredential(fromMail.ToString(), "xxxxxxxx");
                      smtp.Timeout = 20000;

                  }
                  smtp.Send(Msg);
                  reader.Dispose();

              }
          }
          catch (Exception)
          {

              throw;
          }
      }

      protected void getInvitationID(int EventID)
      {
          try
          {
              EventManagerDataContext db = new EventManagerDataContext();
              {
                  var q = (from a in db.EMR_INVITATIONs
                           where a.EventID == EventID
                           select new
                           {
                               a.InvitationID
                           });



                  foreach (var inv in q)
                  {
                      var p = (from a in db.EMR_INVITATIONs
                               where a.InvitationID == inv.InvitationID
                               select new
                               {
                                   a.Email_Address,
                               });



                      foreach (var emailadd in p)
                      {
                          Msg = new MailMessage();
                          Msg.To.Add(new MailAddress(emailadd.Email_Address));
                          getDataforemail(inv.InvitationID);
                      }

                  }
              }
          }
          catch (Exception)
          {

              throw;
          }
      }