How to use a property of an object in asp:SessionParameter

namespace MyNameSpace
{
	using System.Reflection;
	using System.Web;
	using System.Web.UI;
	using System.Web.UI.WebControls;
 
	public class LoggedInUserSessionParameter :
		SessionParameter
	{
		protected override object Evaluate(
			HttpContext context,
			Control control)
		{
			if ((context != null) && (context.Session != null))
			{
				var fieldName = SessionField;
 
				var liui = context.Session[@"CurrentUserInfo"] as LoggedInUserInformation;
				if (liui == null)
				{
					return null;
				}
				else
				{
					return liui.GetType().InvokeMember(fieldName, BindingFlags.GetProperty, null, liui, null);
				}
			}
			else
			{
				return base.Evaluate(context, control);
			}
		}
	}
}

<%@ Register Namespace="MyNameSpace" TagPrefix="mns" %>

<mns:LoggedInUserSessionParameter Name="LegalEntityID" SessionField="LegalEntityID" Type="Int32" />