public bool addPreference(String email, String category, String subject, String description, String target_students, String price_info)
        {
            try
            {
                AccountManager am = new AccountManager();
                string insertQuery;
                int id = am.getID(email);

                SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
                conn.Open();

                insertQuery = "insert into [T.PREFERENCES] (id, category, subject, description, target_students, price_info) values (@ID, @Category, @Subject, @Description, @TargetStudents, @PriceInfo);";
                SqlCommand com = new SqlCommand(insertQuery, conn);
                com.Parameters.AddWithValue("@ID", id);
                com.Parameters.AddWithValue("@Category", category);
                com.Parameters.AddWithValue("@Subject", subject);
                com.Parameters.AddWithValue("@Description", description);
                com.Parameters.AddWithValue("@TargetStudents", target_students);
                com.Parameters.AddWithValue("@PriceInfo", price_info);
                com.ExecuteNonQuery();

                conn.Close();

                return true;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Preference");
                return false;
            }
        }
        protected void LogInBtn_Click(object sender, EventArgs e)
        {
            AccountManager am = new AccountManager();
            if(am.checkLogIn(UsernameTB.Text,PasswordTB.Text))
            {
                statusLbl.Text = "log in correct";
                Session["account"] = UsernameTB.Text;
                Response.Redirect("HomePage.aspx");
            }
            else
            {
                statusLbl.Text = "Log-in Incorrect";
            }

        }
        protected void RegisterBTN_Click(object sender, EventArgs e)
        {
            AccountManager am = new AccountManager();

            int x = Convert.ToInt32(dayDDL.SelectedValue);

            if (am.createAccount(emailTB.Text, passwordTB.Text, lastNameTB.Text, firstNameTB.Text, middleNameTB.Text, Convert.ToInt32(dayDDL.SelectedValue), Convert.ToInt32(monthDDL.SelectedValue), Convert.ToInt32(yearDDL.SelectedValue), genderDDL.SelectedValue, civilStatusDDL.SelectedValue, nationalityTB.Text, contactNumTB.Text, provinceTB.Text, cityTB.Text, zipcodeTB.Text))
            {
                Label1.Text = "Log in Successful!";
            }
            else
            {
                Label1.Text = "Log in not Successful!";
            }
        }