//Обязательно public

public class MySetting{

//желательно прописывать значения по умолчанию а то будет NULL

public stiring Server="myserver.ru";

public short Port=666;

public string MyDocuments="c:\";

}

public static MySettings Settings;

public static void LoadSettings(){

System.Runtime.Xml.Serialization.XmlSerializer xs=new System.Runtime.Xml.Serialization.XmlSerializer(typeof(MySettings));

try{

using(FileStream fs=File.OpenRead("settings.xml"))

Settings=(MySettings)xs.Deserialize(fs);

}catch{

Settings=new MySettings();

}

}

public static void SaveSettings(){

System.Runtime.Xml.Serialization.XmlSerializer xs=new System.Runtime.Xml.Serialization.XmlSerializer(typeof(MySettings));

using(FileStream fs=File.Create("settings.xml"))

xs.Serialize(fs.Settings);

}