Database is not being Updated - Only the Datatable is

Hi guys!
I'm new to C Sharp and the forums. I have this problem where I have to build a project for an agriculture company. I am using datatables to populate the data. The data is read from the database just fine, but the problem arises when I try to save the data(update the table). However the datatable gets updated, but the database doesn't. I am using an object oriented approach, which is working just fine - trust me For coming up with this code, I used the Sams "Teach yourself" series. I need help asap, so any suggestions are appreciated. Thanks in advance...

The code of the addUser form is;

Code:

    public partial class Page2 : Page
    {
        SqlConnection editPDConn = new SqlConnection();
        SqlDataAdapter editPDAdapter;
        SqlCommandBuilder editPDCB;
        DataTable editPDDT = new DataTable();
        int counter, anyErrors;
        string line, Id;
        editPD editThisUser;

        public Page2()
        {
            InitializeComponent();
            editPDConn.ConnectionString =
                @"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\AgTrainDB.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
            editPDConn.Open();
            readUserFromFile();
            getInfo();
            displayInfo();
        }

        private void Page_Loaded(object sender, RoutedEventArgs e)
        {
        }
        
        private void reset_Click(object sender, RoutedEventArgs e)
        {
            ed_firstName.Text = "";
            ed_lastName.Text = "";
            ed_address.Text = "";
            ed_teleNumber.Text = "";
        }

        private void displayInfo()
        {
            ed_userName.Text = editThisUser.UserNameED.ToString();
            ed_firstName.Text = editThisUser.FirstNameED;
            ed_lastName.Text = editThisUser.LastNameED;
            ed_address.Text = editThisUser.AddressED;
            ed_teleNumber.Text = editThisUser.TeleED.ToString();
            ed_userRole.Text = editThisUser.RoleED;
        }

        //With the use of the retreived ID - the info is aquired here
        private void getInfo()
        {
            editThisUser = new editPD();
            editPDAdapter =
                            new SqlDataAdapter("SELECT * FROM users WHERE userId = '" + Id + "'", editPDConn);
            editPDCB =
                new SqlCommandBuilder(editPDAdapter);
            editPDAdapter.Fill(editPDDT);

            SqlCommandBuilder Builder = new SqlCommandBuilder(editPDAdapter);

            if (editPDDT.Rows.Count > 0)
            {
                editThisUser.UserIdED = (int)editPDDT.Rows[0]["userId"];
                editThisUser.UserNameED = editPDDT.Rows[0]["userName"].ToString();
                editThisUser.PasswordED = editPDDT.Rows[0]["userPassword"].ToString();
                editThisUser.FirstNameED = editPDDT.Rows[0]["userFirstName"].ToString();
                editThisUser.LastNameED = editPDDT.Rows[0]["userLastName"].ToString();
                editThisUser.AddressED = editPDDT.Rows[0]["userAddress"].ToString();
                editThisUser.TeleED = (int)editPDDT.Rows[0]["userTele"];
                editThisUser.RoleED = editPDDT.Rows[0]["userRole"].ToString();
            }
        }

        //Get the user ID from the text file so that his/her info can be displayed
        private void readUserFromFile()
        {
            counter = 0;
            //Id = 0;
            StreamReader fromFile = new StreamReader("E:\\loginInfo.txt");
            while ((line = fromFile.ReadLine()) != null)
            {
                if (counter == 2) //ID is in this line
                {
                    Id = line;

                }
                counter++;
            }

            fromFile.Close();

        }

        private void save_Click(object sender, RoutedEventArgs e)
        {
            int a;
            anyErrors = 0;

            if (ed_firstName.Text == "")
            {
                MessageBox.Show("Error! Please enter Your First Name!");
                anyErrors = 1;
            }
            else if (ed_lastName.Text == "")
            {
                MessageBox.Show("Error! Please enter Your Last Name!");
                anyErrors = 1;
            }
            else if (ed_address.Text == "")
            {
                MessageBox.Show("Error! Please enter Your Address!");
                anyErrors = 1;
            }
            else if (ed_teleNumber.Text == "")
            {
                MessageBox.Show("Error! Please enter Your Tele!");
                anyErrors = 1;
            }
            else if (ed_teleNumber.Text != "")
            {
                try
                {
                    a = int.Parse(ed_teleNumber.Text);
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Error! Please enter a numeric Tele!");
                    anyErrors = 1;
                }
            }

            //Set new values to the object
            if (anyErrors != 1)
            {
                editThisUser.FirstNameED = ed_firstName.Text.ToString();
                editThisUser.LastNameED = ed_lastName.Text.ToString();
                editThisUser.AddressED = ed_address.Text.ToString();
                editThisUser.TeleED = int.Parse(ed_teleNumber.Text);
                saveDetails();
            }
        }

        //Saves the details by using the object
        private void saveDetails()
        {
            //editPDDT.Rows[0]["userId"] = editThisUser.UserIdED;
            //editPDDT.Rows[0]["userName"] = editThisUser.UserNameED;
            //editPDDT.Rows[0]["userPassword"] = editThisUser.PasswordED;
            editPDDT.Rows[0]["userFirstName"] = editThisUser.FirstNameED;
            editPDDT.Rows[0]["userLastName"] = editThisUser.LastNameED;
            editPDDT.Rows[0]["userAddress"] = editThisUser.AddressED;
            editPDDT.Rows[0]["userTele"] = editThisUser.TeleED;
            //editPDDT.Rows[0]["userRole"] = editThisUser.RoleED;
            //editPDAdapter.Update(editPDDT);
            this.editPDAdapter.Update(this.editPDDT); //This is where the data should get updated

            editPDConn.Close();
            editPDConn.Dispose();
        }

    }
}