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 Child child = new Child ();//child of abstract Parent class
            XmlWriterSettings xws = new XmlWriterSettings();
            xws.Indent = true;
            xws.IndentChars = "  ";
            XmlWriter xw = XmlWriter.Create("test.xml", xws);
            XmlSerializer xs = new XmlSerializer(typeof(Child));
            xs.Serialize(xw, child);
            xw.Close();                    

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[XmlIgnore]
public Uri Uri {get;set;}

[XmlAttribute("Uri")]
public string UriString {
    get {return (Uri == null) ? String.Empty : Uri.ToString();}
    set {Uri = (String.IsNullOrEmpty(value)) ? null : new Uri(value);}
}                    

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public abstract class Parent
{
    public Uri Uri { get; set; }
}
public class Child : Parent
{
    
}                    

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        Child test = new Child ();
        test.Uri = new Uri("http://www.c-sharp-forum.de/");
        XmlWriter xw = XmlWriter.Create("test.xml");
        XmlSerializer xs = new XmlSerializer(typeof(Child));                    

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foreach(DataRow row in DataTable["data"])
{
                Child child = new Child();
                child.Uri= row["uri"].ToString();
                child.Path = row["path"].ToString();
                [...]
}                    

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        private void MainForm_Load(object sender, EventArgs e)
        {
            DataSet = new DataSet();
            BindingSource = new BindingSource();            

            if (File.Exists(_xmlPath))
                DataSet.ReadXml(_xmlPath);
            else
                CreateTable();

            BindingSource.DataSource = DataSet.Tables["data"];
            dataGridView1.DataSource = BindingSource;
        }