The Site is the object that hosts a Control. Control objects can inherit certain properties from their Site, and these are called ambient properties. At present, the ambient properties are ForeColor, BackColor, Cursor, and Font. If you haven't specified a particular value for any of these properties, the control will retrieve an AmbientProperties object from the site by using the GetService() method. The service required is typeof(AmbientProperties). The control can pull the ambient value from it. If the control is not hosted in a site, or if the site doesn't support ambient properties, the Control.DefaultXXX member will be used to provide the value instead.

public sealed class AmbientProperties {
// Public Constructors
   public AmbientProperties();
// Public Instance Properties
   public Color BackColor{set; get; }
   public Cursor Cursor{set; get; }
   public Font Font{set; get; }
   public Color ForeColor{set; get; }
}