Windows Forms

public static class SC
{
	private static SettingsClass settings = new SettingsClass();
	public static SettingsClass Application
	{
		get { return settings; }
	}
	public class SettingsClass
	{
		Dictionary<string, object> settings = new Dictionary<string,object>();
		public object this[string id]
		{
			get
			{
				return settings[id];
			}
			set
			{
				if (!settings.ContainsKey(id))
					settings.Add(id, value);
				else
					settings[id] = value;
			}
		}
	}
}

SC.Application["key"] = someObject;

public static class SC
{
	private static SettingsClass settings = new SettingsClass();
	public static SettingsClass Application
	{
		get { return settings; }
	}
	public class SettingsClass
	{
		StringObjectDictionary settings = new StringObjectDictionary();
		public object this[string id]
		{
			get
			{
				return settings[id];
			}
			set
			{
				if (!settings.ContainsKey(id))
					settings.Add(id, value);
				else
					settings[id] = value;
			}
		}
	}
}
class StringObjectDictionary : System.Collections.DictionaryBase
{
	public StringObjectDictionary() : base()
	{
	}
	public void Add(string key, object value)
	{
		base.Dictionary.Add(key, value);
	}
	public object this[string key]
	{
		get { return base.Dictionary[key]; }
		set { base.Dictionary[key] = value; }
	}
	public bool ContainsKey(string key)
	{
		return base.Dictionary.Contains(key);
	}
}

Request.Cookies.Add(...);   // add cookie
Request.Cookies[id]...   // access cookie

using System.Web;

public static class SessionHelper
{
	public static string SomeString
	{
		get { return HttpContext.Current.Session["SomeString"] as string; }
		set { HttpContext.Current.Session["SomeString"] = value; }
	}

	public static int SomeNumber
	{
		get { return (int)HttpContext.Current.Session["SomeNumber"]; }
		set { HttpContext.Current.Session["SomeNumber"] = value; }
	}

}

private void button1_Click(object sender, EventArgs e)
{
	WindowsApplication1.Form1 frm = new WindowsApplication1.Form1();
	frm.Show();
}

Private Sub button1_Click(sender as object, e as EventArgs) handles button1.click
	frm as new WindowsApplication1.Form1
	frm.Show()
End Sub