public void UnfriendUser(int friendMappingID)
{
var friendMapping = _UserRepo.RemoveFriendMapping(friendMappingID);
if (friendMapping != null)
{
List <string> connectionIds = _UserRepo.GetUserConnectionID(new int[] { friendMapping.EndUserID, friendMapping.RequestorUserID });
RefreshOnlineUsersByConnectionIds(connectionIds);
}
}