private void Btsave_Click(object sender, RoutedEventArgs e)
        {
            
            {
                System.Windows.Forms.SaveFileDialog dlgSave = new
                System.Windows.Forms.SaveFileDialog();



                if (dlgSave.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    StreamWriter sw = new StreamWriter(dlgSave.FileName + ".txt", false);
                    sw.WriteLine(tbtext);
                }

            }
        }