Simple class to save your Form's Size To Registry

using System;
using System.Drawing;
using System.Windows.Forms;
using Microsoft.Win32;
 
namespace Chico.Registry
{
    public struct SizeRegistry : IDisposable
    {
	private const string kWidthName = "FormWidth",
			kHeightName = "FormHeight";

        private RegistryKey mKey;

        public SizeRegistry(string subkey)
        {
			using (var key = RegistryKey.OpenBaseKey(RegistryHive.CurrentUser, RegistryView.Default))
			{
				mKey = key.CreateSubKey(subkey, RegistryKeyPermissionCheck.ReadWriteSubTree, RegistryOptions.Volatile);
				mKey.OpenSubKey(subkey);
			}
        }

		public Size GetSize()
		{
			int w, h;
			w = (int)mKey.GetValue(kWidthName, 320);
			h = (int)mKey.GetValue(kHeightName, 240);

			return new Size(w, h);
		}
		public void SetSize(Size size)
		{
			mKey.SetValue(kWidthName, size.Width, RegistryValueKind.DWord);
			mKey.SetValue(kHeightName, size.Height, RegistryValueKind.DWord); 
		}

        public void Dipose()
        {
            mKey.Close();           
            mKey.Dispose();            
        }

		public static void StreamFormState(Form f, string subkey, bool is_opening)
		{
			using (var sr = new SizeRegistry(subkey))
			{
				if (is_opening)
					f.Size = sr.GetSize();
				else
					sr.SetSize(f.Size);
			}
		}
    };
}

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
		static readonly string kSizeSubkeyName = Application.ProductName;

		public Form1()
        {
            InitializeComponent();
			SizeRegistry.StreamFormState(this, kSizeSubkeyName, true);         
        }
        void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
			SizeRegistry.StreamFormState(this, kSizeSubkeyName, false);
        }                               
    };
}