public void calcul_textboxs() { double volume = camion.calculVolume(Convert.ToDouble(this.longint_tb.Text), Convert.ToDouble(this.largint_tb.Text), Convert.ToDouble(this.hautint_tb.Text)); double volumelibre = 300; volume_tb.Text = Convert.ToString(volume); volumelibre_tb.Text = Convert.ToString(volumelibre); }