C#

1 public static void foo<T>(T unknown) {
2     PropertyInfo[] tProps = typeof(T).GetProperties();
3     foreach (PropertyInfo pi in tProps) {
4         foo<pi.PropertyType>(pi.GetValue(unknown, null));
5     }
6 }

using System.Windows.Forms;<br />
using System.Collections.Generic;<br />
<br />
class testForm : Form {<br />
<br />
  Storage s = new Storage();<br />
<br />
  testForm() {<br />
    Customer c = new Customer();<br />
    c.Id = "J";<br />
    c.Name = "John";<br />
<br />
    List<Customer> l = new List<Customer>();<br />
    l.Add(c);<br />
    c = new Customer();<br />
    c.Id = "W";<br />
    c.Name = "Walter";<br />
    l.Add(c);<br />
<br />
    ComboBox cm = new ComboBox();<br />
    cm.DisplayMember = "Name";<br />
    cm.ValueMember = "Id";<br />
    cm.DataSource = l;<br />
<br />
    s.CustId = "W";<br />
<br />
    cm.DataBindings.Add("SelectedValue", s, "CustId");<br />
<br />
    Controls.Add(cm);<br />
    Button b = new Button();<br />
    b.Top = 80;<br />
    b.Click += new System.EventHandler(b_Click);<br />
    Controls.Add(b);<br />
<br />
  }<br />
<br />
  void b_Click(object sender, System.EventArgs e) {<br />
    if (s.CustId == null)<br />
      MessageBox.Show("Empty combobox must store null value");<br />
    else<br />
      MessageBox.Show(s.CustId.ToString());<br />
<br />
  }<br />
<br />
  class Customer {<br />
    public string Id { get; set; }<br />
    public string Name { get; set; }<br />
<br />
  }<br />
<br />
  class Storage {<br />
    public string CustId { get; set; }<br />
  }<br />
<br />
  static void Main() {<br />
    Application.Run(new testForm());<br />
  }<br />
}

public class TestClass
{
        //Properties etc.. to go here
}

public class TestCollection : List<TestClass>
{
}

public static void MyMethod(object ListObject)
{
}