Interogating complex objects in a recursive or reflection apprach

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C#

VB

Using the simple declaration of a class and the business logic below that contains lists.

 public class Client
   private ClientList as new list(of Person)
   public property Client as list(of person)
    Get
      Return ClientList
    End Get
    Set(ByVal value As List(Of Client))
      ClientList = value 
    End Set
   end property
 end class

'the person class 
public class Person
 'Variable and properties here
end class

Rather than doing something on the following for each list in the client class?

if client.clientlist.findall(function(p) p.id > 100).count > 0 then
 'do some business logic
elseif client.propertylist.findall(function(p) p.id > 100).count > 0 then
 'do some business logic
end if

Does / Can anyone point me in the right direction where I can interrogate the main class (in this case client), pull out the lists and perform business logic on the contents on the lists in either a recursive or reflection based approach or even suggest a better approach.

I have looked at using propertydescriptorcollection which I can look at each of the properties in the class but I am unable to create a new list based on the property type and populate it with the values of the list.

Grateful for any help
Simon