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var usrId = _userManager.GetUserId(Context.User);
                    var recId = await _context.Correspondences.Include(c => c.Sender).FirstOrDefaultAsync(c => (c.SenderId == receiverId && c.ReceiverId == usrId) || (c.SenderId == usrId && c.ReceiverId == receiverId));
                    sender = _userManager.Users.FirstOrDefault(u => u.Id == recId.SenderId);
                    connId = _chatService.GetConnectionId(recId.SenderId);