Что лучше использовать в учебном проекте по C#?

        public bool CheckIfUnreadMessagesArePresent()
        {
            select* from MessageInfo
            where wasRead = 1 order by  wasRead DESC
        }
 
        public IList<UserInfo> FetchMessagesFromConversation(int userID1, int userID2)
        {
            select* from MessageInfo 
            where userID1 = 1 and userID2 = 3 or userID1 = 3 and userID2 = 1 order by date DESC
        }
 
        public IList<MessageInfo> FetchLastMessageFromEachConversation((int userID))
        {
            select* from MessageInfo
            where date in (
            select max(date)
            from MessageInfo
            where date in (
            select max(date)
            from MessageInfo
            group by userID, receiverid
            order by date desc, userID, receiverid) 
            group by if (userID < receiverid, concat(userID, "-", receiverid), concat(receiverid, "-", userID)));
        }

public bool CheckIfUnreadMessagesArePresent()
        {
            var meassage = dataBaseContext.Database.SqlQuery<MessageInfo>("SELECT * FROM MessageInfo");
            var read = dataBaseContext.Database.SqlQuery<MessageInfo>("WHERE wasRead = 1 ORDER BY  wasRead DESC");
            return read;
        }