I have a model like this:

```
Class1 
{
    public List<Class2> Class2List { get; set; }
}

Class2 
{
    public List<Class3> Class3List { get; set; }
}

Class3 
{
    public List<Class4> Class4List { get; set; }
}

Class4 
{
    public int Value { get; set; }
    public DateTime CreateDate{ get; set; }
}

```

I need to find a list of items of Class4 which are between two dates.
I try to use below code but I need to return list of type Class4:

```
public async Task<IList<Class1>> GetClass4BetweenDates(string Id, DateTime fromDate, DateTime toDate)
{
    var builder = Builders<Class1>.Filter;
    var filter = builder.Eq("Id", Id) & builder.Gte("Class2.Class3.Class4.CreateDate", fromDate) & builder.Lte("Class2.Class3.Class4.CreateDate", toDate);
    return await _context.GetCollection<Class1>().Find(filter).ToListAsync();            
}

```

I know this is wrong. I need to know the correct way