public List<Message> GetAciquirer_Messages(int acquirerId)
 {
     List<Message> list_Message=new List<Message>();
     List<MessageTable> list = db.MessageTables.Where(c => c.ToId == acquirerId&&c.IsSee==false).ToList();
     foreach (MessageTable item in list)
     {
         Message message = new Message()
         {
             FromId=item.FromId,
             MessageContent=item.Message,
             Time=item.Time
         };
         item.IsSee = true;
         list_Message.Add(message);
     }
     db.SaveChanges();
     return list_Message;
 }
 public string SendMessageToAcquirer(Message message)
 {
     MessageTable table = new MessageTable()
     {
         FromId=message.FromId,
         IsSee=false,
         ToId=message.ToId,
         Time=DateTime.Now.ToShortDateString()+" "+DateTime.Now.ToShortTimeString(),
         Message=message.MessageContent,
     };
     db.MessageTables.AddObject(table);
     db.SaveChanges();
     return "OK";
 }