// save new entry (complete) // else = edit current selected enry ( to be complete )
        private void btn_save_Click(object sender, EventArgs e)
        {
            if (tickBox_editMode.Checked == false)
            {
                if (tb_clientName.Text == "")
                {
                    MessageBox.Show("Clients Name can not be empty"); return;
                }
                //normal save mode ( more error checking required - also option on button save yes / no
                string            message = "You are about to add a new Client: " + tb_clientName.Text;
                string            caption = "ClientTable";
                MessageBoxButtons buttons = MessageBoxButtons.YesNo;
                DialogResult      result  = MessageBox.Show(message, caption, buttons);
                if (result == DialogResult.Yes)
                {
                    sql.InsertNewClientData(FM_LoginScreen.conString, "ClientTable", tb_clientName.Text
                                            , tb_addressL1.Text, tb_addressL2.Text, tb_postcode.Text, tb_city.Text,
                                            tb_telephone.Text, tb_mobile.Text, tb_email.Text);

                    // set fields back to blank
                    Clear_fields();
                }
            }
            else
            {
                //editing a row in the database ( to be complete )
                if (tickBox_editMode.Checked)
                {
                    string            message = "You are about to save your changes to Client: " + tb_clientName.Text;
                    string            caption = "ClientTable";
                    MessageBoxButtons buttons = MessageBoxButtons.YesNo;
                    DialogResult      result  = MessageBox.Show(message, caption, buttons);
                    if (result == DialogResult.Yes)
                    {
                        sql.UpdateChangesClientTable(FM_LoginScreen.conString, "ClientTable", Convert.ToInt32(cb_clientselection.Text)
                                                     , tb_clientName.Text, tb_addressL1.Text, tb_addressL2.Text, tb_postcode.Text
                                                     , tb_city.Text, tb_telephone.Text, tb_mobile.Text, tb_email.Text);

                        tickBox_editMode.Checked = false;
                    }
                }
            }
        }