private void btnExport_Click(object sender, EventArgs e)
 {
     if (fileListBox.Items.Count == 0)
     {
         MessageBox.Show("Nu exista nimic de concatenat. \nFolositi butonul de adaugare pentru a adauga fisiere"); //No files exist. Use add button to add some
         return;
     }
     if (exportDialog.ShowDialog() == DialogResult.OK)
     {
         Concatenator concatenator = new Concatenator(exportDialog.FileName);
         foreach (string file in fileListBox.Items)
         {
             try
             {
                 concatenator.Append(file);
             }
             catch (ArgumentException ex)
             {
                 MessageBox.Show(ex.Message, "Eroare");
             }
         }
         concatenator.Save();
     }
 }
 private void btnExport_Click(object sender, EventArgs e)
 {
     if (fileListBox.Items.Count == 0)
     {
         MessageBox.Show("Nu exista nimic de concatenat. \nFolositi butonul de adaugare pentru a adauga fisiere"); //No files exist. Use add button to add some
         return;
     }
     if (exportDialog.ShowDialog() == DialogResult.OK)
     {
         Concatenator concatenator = new Concatenator(exportDialog.FileName);
         foreach (string file in fileListBox.Items)
         {
             try
             {
                 concatenator.Append(file);
             }
             catch (ArgumentException ex)
             {
                 MessageBox.Show(ex.Message, "Eroare");
             }
         }
         concatenator.Save();
     }
 }