C#

<code>g.DrawLine(myPen, this.ClientRectangle.Width/2, 0, this.ClientRectangle.Width/2, this.ClientRectangle.Height);
g.DrawLine(myPen, 0, this.ClientRectangle.Height/2, this.ClientRectangle.Width, this.ClientRectangle.Height/2);

using (System.IO.StreamWriter sw = new System.IO.StreamWriter("test.txt",false))
{
	foreach(object o in this.comboBox1.Items)
	{
		sw.WriteLine(o.ToString());
	}
	sw.Close();
}

using (x)
{
 using(x.y)
 {
   x.Close();
 }
}

using (x)
{
 using(x.y)
 {
   x.Close();
 }
 // Try to use x here. Oops, ObjectDisposedException
}

...
bool isItemPresent = comboBox.Items.Contains(itemToBeFound);

[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr DefWindowProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);