public abstract class CustomPreference : PreferenceBase

[Spotfire.Dxp.Framework.Persistence.PersistenceVersion(1, 0)]
public class MyPreference : CustomPreference
{
    private PreferenceProperty<string> myString; // Defaults to null
    private PreferenceProperty<ArrayList> numberList;

    public override string Category
    {
        get { return "MyCategory"; }
    }

    public override string SubCategory
    {
        get { return "MySubCategory"; }
    }

    public void AddToList(int value)
    {
        this.numberList.Value.Add(value);
        // Notify the framework of changes
        this.numberList.OnValueChanged();
    }

    public string MyString
    {
        get { return this.myString.Value; }
        set
        {
            // The framwork is aware of the change to the property since
            // it is explicitly set.
            this.myString.Value = value;
        }
    }

    public MyPreference()
    {
        this.myString = this.AddPreference<string>(
            new PreferenceProperty<string>(
            "myString", "1.0",
            PreferencePersistenceScope.Server,
            PreferenceUsage.SingleUser));

        this.numberList = this.AddPreference<ArrayList>(
            new PreferenceProperty<ArrayList>(
                "numberList", "1.0",
                PreferencePersistenceScope.Server,
                PreferenceUsage.SingleUser,
                delegate
                {
                    // Calculate the default value
                    ArrayList defaultList = new ArrayList();
                    defaultList.Add(10);
                    return defaultList;
                }));
    }
}