public frmShareFileSelection(BitChatNode node, SharedFile sharedFile)
        {
            InitializeComponent();

            BitChat[] sharedChats = sharedFile.GetChatList();

            foreach (BitChat chat in node.GetBitChatList())
            {
                bool found = false;

                foreach (BitChat sharedChat in sharedChats)
                {
                    if (sharedChat == chat)
                    {
                        found = true;
                        break;
                    }
                }

                if (!found)
                {
                    checkedListBox1.Items.Add(chat);
                }
            }
        }