private void UsersListOnline_ItemActivate(object sender, EventArgs e)
        {
            var receiver = usersListOnline.SelectedItems[0].Text;

            if (privMessagesStarted.Contains($"{receiver},authorize"))
            {
                ShowPrivMessage(receiver, privMessagesTest.FirstOrDefault(x => x.ConversationBetween.Contains(receiver)).TopicName);

                //PrivMessage.something = true;
            }
            else if (LoginForm.loginData[0] != receiver)
            {
                string topicName = $"{Guid.NewGuid().ToString()}/{receiver}";
                //subuje kanał z nazwą użytkownika po czym wysyła wiadomość informującą klienta o połączeniu
                client.Subscribe(new string[] { $"{LoginForm.loginData[1]}/{receiver}" }, new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE });
                client.Publish($"{LoginForm.loginData[1]}/{receiver}", Encoding.UTF8.GetBytes($"{LoginForm.loginData[0]},{topicName},authorize"), MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE, false);
                //unsubuje topic nasłuchowy klienta
                client.Unsubscribe(new string[] { $"{LoginForm.loginData[1]}/{receiver}" });
                //otwiera okno z prywatnym chatem

                privMessagesStarted.Add($"{receiver},authorize");
                var privMessage = new PrivMessage(receiver, topicName);
                privMessage.Show();
                //selectedUser = new List<string>(new string[] { null, null });
            }
            else
            {
                MessageBox.Show("Nie możesz chatować ze sobą, chyba że 'jest nas wielu' to okej ale nie tutaj", "Ni dy rydy", MessageBoxButtons.OK);
            }
        }
 private void ShowPrivMessage(string user, string topicNameGenerated)
 {
     //privMessage.Show();
     if (this.InvokeRequired)
     {
         this.Invoke(new Action <string, string>(ShowPrivMessage), user, topicNameGenerated);
     }
     else
     {
         //PrivMessage privMessageRecv = new PrivMessage();
         //Application.Run(privMessage);
         var currentPrivMessage = privMessagesTest.FirstOrDefault(x => x.ConversationBetween.Contains(user));
         if (currentPrivMessage != null)
         {
             currentPrivMessage.PrivMessage.Show();
         }
         else
         {
             var privMessage = new PrivMessage(user, topicNameGenerated);
             privMessage.Show();
         }
     }
 }