db.SaveChanges(); not working plz help me

Question

 

public ActionResult Register(Models.Registration user)

{

try

{

if (ModelState.IsValid)

{

using (var db = new LoginInMVC4WithEF.Models.UserEntities2())

{

var crypto = new SimpleCrypto.PBKDF2();

var encrypPass = crypto.Compute(user.Password);

var newUser = db.Registrations.Create();

newUser.Email = user.Email;

newUser.Password = encrypPass;

newUser.PasswordSalt = crypto.Salt;

newUser.FirstName = user.FirstName;

newUser.LastName = user.LastName;

newUser.UserType = "User";

newUser.CreatedDate = DateTime.Now;

newUser.IsActive = true;

newUser.IPAddress = "642 White Hague Avenue";

db.Registrations.Add(newUser);

db.SaveChanges();

return RedirectToAction("Index", "Home");

}

}

else

{

ModelState.AddModelError("", "Data is not correct");

}

}