Can not send email using Google setting. Getting errors

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SMTP

MVC5

C#6.0

Hi guys

I'm developing a system that will send emails to supplier with a Quotations# attached to the body of the email. But just before going in deep of my assignment,
I'm currently getting this following error when i'm sending a simple email from my View Page.

System.Net.Sockets.SocketException (0x80004005): A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 74.125.206.109:25 at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress) at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)

Please Anyone Help is very welcome!!!!
It's urgent.

What I have tried:

I have tried this following:

try{
   mail.To.Add(obj.ToEmail);
                mail.From = new MailAddress("myemail@gmail.com");
                mail.Subject = obj.EmailSubject;
                mail.Body = obj.EMailBody;
                mail.IsBodyHtml = true;
                SmtpClient smtp = new SmtpClient("smtp.gmail.com", 25); //I also tried 587 port but no luck
                smtp.EnableSsl = true;
                smtp.UseDefaultCredentials = false;
                smtp.Credentials = new System.Net.NetworkCredential("myemail@gmail.com", "password");
                smtp.Send(mail);


                ViewBag.Status = "Email Sent Successfully.";
      }
      catch (Exception ex)
      {
                ViewBag.Status = ex.GetBaseException();
               // ViewBag.Status = "Problem while sending email, Please check details.";

       }
            return View();
        }