List of Class To XML File ,C#

if you create a collection class that have a list of Class Like :

    public class Foo
    {
        public List BarList { get; set; }
    }

    public class Bar
    {
 public string Property1 { get; set; }
 public string Property2 { get; set; }
    }

we can use XmlSerializer to Save Collection to XML File

 Foo f = new Foo();
 f.BarList = new List();
 f.BarList.Add(new Bar { Property1 = "abc", Property2 = "def" });
 XmlSerializer ser = new XmlSerializer(typeof(Foo));
 using (FileStream fs = new FileStream(@"c:\sertest.xml", FileMode.Create))
 {
  ser.Serialize(fs, f);
 }