Entity Framework Update

repository.cs

public void Update(Entity currentEntity)
{
  using(var db = new Context())
  {
    db.DbSet.Attach(currentEntity);
    db.Entry(currentEntity).State = EntityState.Modified;
    // V4
    ////context.ObjectStateManager.ChangeObjectState(currentEntity, EntityState.Modified);
    db.SaveChanges();
  }
}