C#

using System.Collections;
...
            ArrayList a = new ArrayList();
            Hashtable h = new Hashtable();
            h.Add( "One", 1 );
            h.Add( "Two", 2 );
            a.Add( h );

            // Later
            h = (Hashtable)a[0];
            Console.WriteLine( h["One"] );

<br />
		public TreeNode Search(TreeNodeCollection col)<br />
		{<br />
			// Create an enumerator for the collection.<br />
			IEnumerator myEnumerator = col.GetEnumerator();<br />
			TreeNode node = null;<br />
			while(myEnumerator.MoveNext())<br />
			{<br />
				System.Console.Out.WriteLine(((TreeNode)myEnumerator.Current).Text + ": "+ ((TreeNode)myEnumerator.Current).FullPath);<br />
<br />
				if ( ((TreeNode)myEnumerator.Current).FullPath == textBox1.Text) // Make the right comparision<br />
					return ((TreeNode)myEnumerator.Current);<br />
				else<br />
				{<br />
					node = Search( ((TreeNode)myEnumerator.Current).Nodes );<br />
				}<br />
			}<br />
			return node;<br />
		}<br />
<br />
		private void button1_Click(object sender, System.EventArgs e)<br />
		{<br />
			TreeNode node = Search(treeView1.Nodes);<br />
			if (node!=null)<br />
			{<br />
				treeView1.SelectedNode = node;<br />
				treeView1.Select();<br />
			}	<br />
		}<br />

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class TheClass : MyAbstract, IMyInterface
{
}

Form2 frm=new Form2();

class Form2 : Form {
Form1 frmRef; // Reference to first form
//...
}