Simple extension method to write and load data to xml. There are lots of caveats to this code, like all items in class T need to be Serializable.

XmlTools.cs

using System.IO;
using System.Xml.Serialization;

public static class XmlTools
{
	public static void SaveAsXml<T>(T data, string filename)
	{
	    var serializer = new XmlSerializer(typeof(T));
	    using (var w = new StreamWriter(filename))
	    {
	        serializer.Serialize(w, data);
	    }
	}

	public static T LoadXml<T>(string filename) where T : class
	{
	    T data;
	    var serializer = new XmlSerializer(typeof(T));
	    using (var r = new StreamReader(filename))
	    {
	        data = (T)serializer.Deserialize(r);
	    }
	    return data;
	}
}