private void LoadDefaultSettings()
 {
     ListUsers     = BLL_UserRegistration.GetListUser();
     ListLocations = BLL_UserRegistration.GetListLocations();
     SetGridView();
     SetCountryComboBox();
 }
        public void AddNewUser()
        {
            MOD_UserTable NewUser = new MOD_UserTable()
            {
                first_names_usr = mtb_names.Text,
                last_names_usr  = mtb_lastname.Text,
                phone_usr       = mtb_phone.Text,
                address_usr     = mtb_address.Text,
                city_usr        = Convert.ToInt32(cmb_cities.SelectedValue)
            };

            var r = BLL_UserRegistration.AddNewUser(NewUser);

            MessageBox.Show(r);

            Clean();
            LoadDefaultSettings();
        }