C# Asp.net lägga till data i databas med entity

userID - primarykey INT autoincr
userName - varchar(50)
userPassword - varchar(50)
userFullName - varchar(50)

string username = usernameTextBox.Text;

            catenappEntities db = new catenappEntities();
            var user_info = db.user_Profile
                .SingleOrDefault(c => c.userEmail == username);

printUserNameLabel.Text  = user_info.userName;

var context = new catenappEntities();

            var t = new user_Profile
            {
                userID = int.Parse(userIDTextBox.Text),
                userFirstName = userFirstNameTextBox.Text,
                userLastName = userLastNameTextBox.Text,
                userEmail = userEmailTextBox.Text,
                userPassword = userPasswordTextBox.Text,
               
        };

            context.user_Profile.Add(t);
            context.SaveChanges();