private bool isUserExists(User user)
 {
     return(FBManaging.isDataInPathExist(_firebase, FBConfigurations.ROOT_USERS + "/" + user.NAME).GetAwaiter().GetResult());
 }
 private bool isChannelExists(Channel channel)
 {
     return(FBManaging.isDataInPathExist(_firebase, globalChannelsPath + "/" + channel.NAME).GetAwaiter().GetResult());
 }