I want update my table with two conditions :

Type == "Employee" && Approved == false

and I use this code :

using (NoavaranModel.NoavaranEntities1 db=new NoavaranModel.NoavaranEntities1())

{

    var query = db.Students.Where(p => p.Type == " Employee" && p.Approved == false).Single();

    query.IsRecivedSMS = true;

    db.SaveChanges();

}

but it's not working. Just updates one recode in db. How can I update all rows with above conditions in Entity Framework?