C# - Get A List Of Banned Users By Date Descending?

Im doing something like this to get a list of all users that have been blocked:

public IQueryable<Aspnet_User> GetBannedUsers()
{
return db.Aspnet_Memberships.Where(x => x.IsApproved == false).Select(x => x.Aspnet_User);
}

Im doing this to block users:

MembershipUser user = Membership.GetUser(username);
if (user != null)
{
user.IsApproved = isApproved;
Membership.UpdateUser(user);
}

how can i get the list of banned users ordered by date they were banned.