public void AddUser(string ID, string Username, string Usernick, string email) { if (UsersList.InvokeRequired) { ChangeResultsDataSourceCallback CallBack = new ChangeResultsDataSourceCallback(AddUser); UsersList.Invoke(CallBack, new object[] { ID, Username, Usernick, email }); } else { ListViewItem CurItem = UsersList.Items.Add(ID); CurItem.SubItems.Add(Username); CurItem.SubItems.Add(Usernick); CurItem.SubItems.Add(email); } }