You need a stream and a XmlSerializer object, here's an example:
FileStream fs = new FileStream(@"C:\MyPath", FileMode.OpenOrCreate);xmlSerializer = new XmlSerializer(typeof(MyClass));xmlSerializer.Serialize(fs, myClassInstance);fs.Flush();fs.Close();fs.Dispose();
Don't forget to handle errors your own way. And I'm also assuming you want to serialize all your class' properties.