private void submitButton_Click_1(object sender, EventArgs e)
        {
            string customerType;
            string loginID = txtLoginID.Text;
            string password = txtPassword.Text;
            string name = txtName.Text;
            string ic = txtIC.Text;
            string contactNum = txtContactNum.Text;
            int comboIndex = comboCustomerType.SelectedIndex;

            bool valid = validation(loginID, password, name, ic, contactNum, comboIndex);

            if (valid)
            {
                customerType = comboCustomerType.SelectedItem.ToString();
                cmd.Connection = registerConn;
                cmd.CommandText =
                    "INSERT INTO CustomerDetail ([LoginID], [Password], [Name], [IC], [ContactNum], [CustomerType])" +
                    "VALUES('" + loginID + "','"
                                + password + "','"
                                + name + "','"
                                + ic + "','"
                                + contactNum + "','"
                                + customerType + "')";

                try
                {
                    registerConn.Open();

                    cmd.Parameters.AddWithValue("", loginID);
                    cmd.Parameters.AddWithValue("", password);
                    cmd.Parameters.AddWithValue("", name);
                    cmd.Parameters.AddWithValue("", ic);
                    cmd.Parameters.AddWithValue("", contactNum);

                    int temp = cmd.ExecuteNonQuery();

                    if (temp > 0)
                    {
                        MessageBox.Show("Register Successfully!");
                    }
                    else
                    {
                        MessageBox.Show("Not Able to register!");
                    }

                    registerConn.Close();

                    this.Hide();
                    Login login = new Login();
                    login.ShowDialog();
                }
                catch (Exception err)
                {
                    MessageBox.Show(err.Message);
                    registerConn.Close();
                }
            }
        }
 private void btnLogOut_Click(object sender, EventArgs e)
 {
     this.Hide();
     Login login = new Login();
     login.ShowDialog();
 }