Adding object to list within a list (nested list?)

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C

C#

WinForms

Objective-C

I have a winforms application which consists of a Van class and a delivery class.

Van class:

public class Van
    {
        private string VanNumber;
        public string vanNumber
        {
            get { return VanNumber; }
            set { VanNumber = value; }
        }

        public List<Delivery> Deliveries = new List<Delivery>();

        public override string ToString()
        {
            return VanNumber.ToString();
        }


    }

Delivery class:

public class Delivery
    {
        private string CustomerName;
        public string customerName
        {
            get { return CustomerName; }
            set { CustomerName = value; }
        }
        private string CustomerAddress;
        public string customerAddress
        {
            get { return CustomerAddress; }
            set { CustomerAddress = value; }
        }
        private DateTime ArrivalTime;
        public DateTime arrivalTime
        {
            get { return ArrivalTime; }
            set { ArrivalTime = value; }
        }

        public override string ToString()
        {
            return CustomerName + " " + CustomerAddress + " " + ArrivalTime.ToString();
        }
    }

I need to be able to store a list of vans, which I have done successfully using a combobox. What I now want to do, is add an instance of my delivery class to the list within a van stored in the combobox. I have a button on my main form(contains combobox) which links to form for adding deliveries. Ideally, i'd like to be able to highlight a van in the combobox and add a delivery via the 'add delivery' form. I just have no idea how to do this!

Any help is greatly appreciated!!