//performance Impact : high
                //EntityFramwork.account account = conn.accounts.Where(x => x.Username == username)
                //.FirstOrDefault();

                //performance Impact : low
                var query = from c in conn.accounts
                            where c.Username == username
                            select c;
                EntityFramwork.account account = query.FirstOrDefault();
                if (account != null)
                {
                    exists = true;
                    this.Password = account.Password;
                    this.IP = account.IP;
                    this.EntityID = (uint)account.EntityID;
                    this.State = (AccountState)account.State;
                    this.Email = account.Email;
                }