how to display the Error Message in Mvc ..?

Question

 

 

 1.when i click the save ,save successfull message has to be come like this green Colour message box

 

2.when i click save if some Error have Error message also dispaly like this Red Colour MEssage box 

 

   hi i want to display the Error message like this Please tell me if you know this i tried so many ways but  i can show Error alert only please  help me for this i have given my code also please help me  

 

[HttpPost]

public ActionResult Index(MailModel objModelMail, HttpPostedFileBase fileUploader)

{

if (ModelState.IsValid)

{

Thread email = new Thread(delegate()

{

string from = "[email protected]"; //example:- [email protected]

using (MailMessage mail = new MailMessage(from, objModelMail.To))

{

mail.Subject = objModelMail.Subject;

mail.Body = objModelMail.Body;

if (fileUploader != null)

{

string fileName = Path.GetFileName(fileUploader.FileName);

mail.Attachments.Add(new Attachment(fileUploader.InputStream, fileName));

}

mail.IsBodyHtml = false;

SmtpClient smtp = new SmtpClient();

smtp.Host = "smtp.gmail.com";

smtp.EnableSsl = true;

NetworkCredential networkCredential = new NetworkCredential(from, "XXXXXXX");

smtp.UseDefaultCredentials = true;

smtp.Credentials = networkCredential;

smtp.Timeout = int.MaxValue;

smtp.Port = 587;

smtp.Send(mail);

ViewBag.Message = "Sent";

}

});

email.IsBackground = true;

email.Start();

ParsingTemplate();

return View("Index", objModelMail);//I need that successful message here itself

}

else

{

return View();//i need that Error Message here itself

}

}