public void ShareScrennNotification(string from, string connectionString)
        {
            ScrenShareForm screenShareForm = new ScrenShareForm(from, connectionString, false);

            ClientInformation.ShareScreenWindows.Add(from, screenShareForm);
            screenShareForm.Show();
        }
 public void GroupShareScreenNotification(string sender, string groupName, string connectionString)
 {
     if (!ClientInformation.ShareScreenWindows.ToList().Exists(x => x.Key == groupName))
     {
         ScrenShareForm screenShareForm = new ScrenShareForm(groupName, connectionString, true);
         ClientInformation.ShareScreenWindows.Add(groupName, screenShareForm);
         screenShareForm.Show();
     }
 }