C#

void Application_Idle(object sender, EventArgs e)
{
    while (AppStillIdle())
        game.Tick(); //updates the game clock and calls Game.Update and GameDraW
}

private bool AppStillIdle()
{
    NativeMethods.Message msg;
    return !(NativeMethods.PeekMessage(out msg, IntPtr.Zero, 0, 0, 0));
}

using System.Windows.Forms;

public partial class Form1 : Form
{
    ListBox listBox1;
    public Form1()
    {
        InitializeComponent();
        listBox1 = new ListBox();
        Controls.Add(listBox1);
        FillList();
        MyClass secondItem = (MyClass)listBox1.Items[1];
        MessageBox.Show(secondItem.MyStringProperty);
    }
    void FillList()
    {
        listBox1.Items.AddRange(new object[]{
                new MyClass("A"),
                new MyClass("B"),
                new MyClass("C"),
            });
    }
}
public class MyClass
{
    public MyClass(string myStringProperty)
    {
        MyStringProperty = myStringProperty;
    }
    public string MyStringProperty
    {
        get;
        set;
    }
    public override string ToString()
    {
        return MyStringProperty;
    }
}

System.Row.DataRowView item = (System.Row.DataRowView)Listbox.items[i];