public void Validchangeroomname(string message)
{
Dictionary <string, string> Changeroomname = jsonHelp.getchangeroomnameinfo(message);
string changeroomname = Changeroomname[Jsonname.Roomname];
App.Current.Dispatcher.InvokeAsync(() =>
{
Roomname = string.Empty;
Roomname = changeroomname;
});
}