public static void chargerImage(etat e, FormControlePrintScreen form)
        {
            switch (e)
            {
            case etat.initial:
                form.Hide();
                System.Threading.Thread.Sleep(250);
                FormWindowScreen formWS = new FormWindowScreen();
                formWS.ShowDialog();
                break;

            case etat.fonctionnement:
                using (MemoryStream s = new MemoryStream())
                {
                    try
                    {
                        //save graphic variable into memory
                        FormControlePrintScreen.imprimeEcran.Save(s, ImageFormat.Bmp);
                        form.pictureBoxMain.Size = new System.Drawing.Size(form.Width, form.Height);
                        //set the picture box with temporary stream
                        form.pictureBoxMain.Image = Image.FromStream(s);
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.GetType().ToString());
                    }
                    finally
                    {
                    }
                }
                break;
            }
        }
        private void buttonNew_Click(object sender, EventArgs e)
        {
            this.Hide();
            System.Threading.Thread.Sleep(250);
            FormWindowScreen formWS = new FormWindowScreen();

            formWS.ShowDialog();
        }