Maintain control state in ASP.NET

using System;
using System.ComponentModel;
using System.Web.UI;
 
[Serializable()]
[ToolboxData( "<{0}:MyControl runat=\"server\">" )]
public class MyControl: Control
{
    [Serializable()]
    private struct MyControlProperties
    {
        public int Property1;
        public string Property2;
    }
 
    private MyControlProperties _properties = new MyControlProperties();
 
    [DefaultValue( 0 )]
    public int Property1
    {
        get
        {
            return _properties.Property1;
        }
        set
        {
            _properties.Property1 = value;
        }
    }
 
    [DefaultValue( "" )]
    public string Property2
    {
        get
        {
            return _properties.Property2;
        }
        set
        {
            _properties.Property2 = value;
        }
    }
 
    protected override void OnInit( System.EventArgs e )
    {
        base.OnInit( e );
 
        Page.RegisterRequiresControlState( this );
    }                   
 
    protected override object SaveControlState()
    {
        return _properties;
    }
 
    protected override void LoadControlState( object savedState )
    {
        _properties = (MyControlProperties)savedState;
    }
}