✅ Help,web chat, i’m stuck

public class ChatHub : Hub 
    {
        private readonly ChatContext _context;
        public ChatHub(ChatContext context)
        {
            _context = context;
        }
        public async Task SendMessage(string user, string message)
        {
              var messageEntity = new Message
                {
                    UserId = 1, // Replace with actual user ID
                  Content = message,
                    Timestamp = DateTime.UtcNow
                };
                _context.Messages.Add(messageEntity);
                await _context.SaveChangesAsync();
            
            await Clients.All.SendAsync("ReceiveMessage", user, message);
           
        }