Generating Diagrams from a Data Source

class Diagram {
    public List<Item> Items { get; set; }
    public List<Link> Connections { get; set; }
    public List<Group> Groups { get; set; }
    public Diagram() {
        Items = new List<Item>();
        for(int i = 0; i < 5; i++)
            Items.Add(new Item { Id = i, Name = "Item " + i });
        Connections = new List<Link>();
        var rand = new Random();
        for(int i = 0; i < 5; i++)
            Connections.Add(new Link { Item1 = Items[rand.Next(0, Items.Count - 1)], Item2 = Items[rand.Next(0, Items.Count - 1)] });
        Groups = new List<Group>();
        for(int i = 0; i < 10; i++)
            Groups.Add(new Group() { Name = "Group " + i });
        foreach(var item in Items)
            Groups[rand.Next(0, Groups.Count)].Items.Add(item);
    }
}

public class Item {
    public int Id { get; set; }
    public string Name { get; set; }
}
public class Link {
    public Item Item1 { get; set; }
    public Item Item2 { get; set; }
}
public class Group {
    public Group() {
        Items = new List<Item>();
    }
    public string Name { get; set; }
    public List<Item> Items { get; set; }
}

public Form1() {
    InitializeComponent();
    Diagram diag = new Diagram();
    diagramDataBindingController1.DataSource = diag.Items;
    diagramDataBindingController1.ConnectorsSource = diag.Connections;
    diagramDataBindingController1.ConnectorFromMember = "Item1";
    diagramDataBindingController1.ConnectorToMember = "Item2";
}