Using webbrowser, listbox...

my new task:
*A text file of bookmarks will be loaded into the listbox. If the text file does not exist, or an exception occurred, a messagebox will be used to display an error message.

i did what he asked and is in "Form1_Load" but everytime i open the program the list i have is says "System.IO.StreamReader".
and when i close it gives me warning: "The process cannot access the file because it is being used by another process.
This warning doesn't pop if i bookmark(add) some website to my listbox.

ok...i updated my code to this:

  private void btn_go_Click(object sender, EventArgs e)
  {
  wBrowser.Navigate(tbx_website.Text);
  }

  private void btn_bookmark_Click(object sender, EventArgs e)
  {
  //Add the url to the listbox
  LBlist.Items.Add(tbx_website.Text);
  }

  private void btn_delete_Click(object sender, EventArgs e)
  {
  // The Delete button was clicked
  int i_delete = LBlist.SelectedIndex;
 
  try
  {
  // Remove the item in the List.
  LBlist.Items.RemoveAt(i_delete);

  if (LBlist.Items.Count == 0)
  {
  btn_delete.Enabled = false;
  }
  }
  catch
  {
  }
  }

  private void listbox_DoubleClick(object sender, EventArgs e)
  {
  wBrowser.Navigate(LBlist.SelectedIndex.ToString());
 
  }

  private void wBrowser_Navigated(object sender, WebBrowserNavigatedEventArgs e)
  {
  tbx_website.Text = wBrowser.Url.ToString();
  }

  private void LBlist_SelectedIndexChanged(object sender, EventArgs e)
  {
  if (LBlist.Items.Count == 0)
  {
  btn_delete.Enabled = false;
  }
  }
  private void Form1_Load(object sender, EventArgs e)
  {
  // test to exists 'bookmarks.txt' in the current path
  if (File.Exists("bookmarks.txt"))
  {
  StreamReader sr = new StreamReader("bookmarks.txt");  
      foreach (string item in sr.ToString().Split(new char[] { ';' })) LBlist.Items.Add(item);
  }
  else
  {
  MessageBox.Show("No found the file!");
  }
  btn_delete.Enabled = false;
  }
  private void Form1_FormClosed(object sender, FormClosedEventArgs e)
  {
  StreamWriter sw_file;
  string s_bmfile = "";
  foreach (object item in LBlist.Items) s_bmfile += item.ToString() + ";";
  try
  {
  sw_file = new StreamWriter("bookmarks.txt");
  sw_file.Write(s_bmfile); sw_file.Close();
  }
  catch (Exception ex)
  {
  MessageBox.Show(ex.Message);
  }
  }

In .Net, unlike other systems, output files must be flushed. You should use the using statement for the StreamWriter object as shown in How to write to a text file in C#; that is the easiest way to ensure that details such as flushing are done. I am sorry I did not see that before; at least now you know that flushing is a requirement. So remember to flush after output.

Note that nearly always, you do not need to flush until after all data is written. In other words, you must flush before closing but the using statement will take care of closing too.

i tried the form_closing and its not working

my bookmarks.txt is empty..

Try FormClosing instead of FormClosed.

everything looks fine. I added FormClosed but its not working.
whatever is on the listbox has to save on txt.file(bookmarks.txt) when form is closed.

i have this:
        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
           
            StreamWriter sw_file;
            string s_save = LBlist.Items.ToString();

            sw_file = new StreamWriter("bookmarks.txt");
            sw_file.Write(s_save);

        }

Help me, pls...

thank you sam.

Another Question: my double click is not working properly.   its gives numbers when i double click the selectedindex from listbox....or how to openly directly to webbrowser when you double click the selectediindex.

Try using the following in LBlist_SelectedIndexChanged:


That way it will be enabled when there are items. You also should enable the button after adding an item. Also, whenever your program uses LBlist.SelectedIndex, it should check if it is -1.