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can somebody please guide me how to generate an event if the date in list box is changed
 
I am filling the list with all the online users on skype using sky4com library. If a new user comes online i want to update my form and display the new online user too in the listbox. Thanks in advance for any help.
 
  
using SKYPE4COMLib;
using System.Runtime.InteropServices;
 
 List<string> online_users = new List<string>();
 IEnumerable<SKYPE4COMLib.User> users;
 

Update_listbox();
            listBox1.DataSource = online_users;
 

 
        public void Update_listbox()
        {
            users = skype.Friends.OfType<SKYPE4COMLib.User>();
 
            users
                .Where(u => u.OnlineStatus == TOnlineStatus.olsOnline)
                .OrderBy(u => u.Handle)
                .ToList()
                .ForEach(u =>  online_users.Add(u.Handle));
            Update();
           
        }
Posted 11-Jul-13 1:15am
Edited 11-Jul-13 1:17am
v2
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Solution 1

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Solution 2

The event should not get generated by the ListBox but some underlying logic. Bind the ListBox to a BindingList[^] instead of a List. Any changes to the list will get displayed without the Update() call.
 
However, you still need the method known as Update_listbox(). Just name it according to its purpose: changing your bound online users list.
 
And then again, you need to call it. How is it called now? Does the skype4com library provide an event?
 
As a last resort, there's always a Timer (or this, or that) to poll the data.
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