This is my User Table

FirstName

LastName

MoneyEarned

I need to set the MoneyEarned to 0 and I do not want to change the firstname and lastname that is already stored in the DB, this is my function can you anyone advise me please to rewrite the update function please.

 
        public void UpdateMoneyEarned(User user)
        {
            using (var db = new TeachableEntities())
            {
                user.MoneyEarned = 0;
                var q = db.Users;
                db.submitchanges();
                

            }
        }