private void btSave_Click(object sender, EventArgs e)
        {
            FileDialog saveFileDialog = new SaveFileDialog();
            saveFileDialog.Filter = "Fichiers texte|*.txt|Tous les fichiers|*.*";
            saveFileDialog.FilterIndex = 1;
            saveFileDialog.RestoreDirectory = true;

            if (saveFileDialog.ShowDialog() == DialogResult.OK)
            {
                string path = saveFileDialog.FileName;
                File file = new File(path);
                try{
                    file.write(tbResult.Text);
                    MessageBox.Show("Enregistrement effectué.");
                }
                catch (Exception ex){
                    MessageBox.Show("Une erreur est survenue lors de l'écriture du fichier: " + ex.Message);
                }

            }
        }
        private String openFile() {
            string content = "";
            FileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Filter = "Fichiers texte|*.txt|Tous les fichiers|*.*";
            openFileDialog.FilterIndex = 1;
            openFileDialog.RestoreDirectory = true;

            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                string path = openFileDialog.FileName;
                File file = new File(path);
                try
                {
                    content= file.read();

                }
                catch (Exception ex)
                {
                    MessageBox.Show("Une erreur est survenue lors de l'écriture du fichier: {0}.", ex.Message);
                }

            }
            return content;
        }