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Rappresenta un insieme di coppie chiave/valore organizzate in base al codice hash della chiave.

using System;
using System.Collections;
class Example
{
	public static void Main()
	{
		Hashtable htTest = new Hashtable();
		htTest.Add("txt", "notepad.exe");
		htTest.Add("bmp", "paint.exe");
		htTest.Add("dib", "paint.exe");
		htTest.Add("rtf", "wordpad.exe");
		try
		{
			htTest.Add("txt", "winword.exe");
		}
		catch
		{
			Console.WriteLine("Un elemento con 'Key' = 'txt' esiste gia.");
		}
		Console.WriteLine("Per la 'key' = 'rtf', 'Value' = {0}.", htTest["rtf"]);
		htTest["rtf"] = "winword.exe";
		Console.WriteLine("Per la 'key' = 'rtf', 'Value' = {0}.", htTest["rtf"]);
		htTest["doc"] = "winword.exe";
		if (!htTest.ContainsKey("ht"))
		{
			htTest.Add("ht", "hypertrm.exe");
			Console.WriteLine("Valore aggiunto con 'key' = 'ht', 'Value' = {0}", htTest["ht"]);
		}
		Console.WriteLine();
		foreach( DictionaryEntry de in htTest )
		{
			Console.WriteLine("'Key' = {0}, 'Value' = {1}", de.Key, de.Value);
		}
		ICollection valueColl = htTest.Values;
		Console.WriteLine();
		foreach( string s in valueColl )
		{
			Console.WriteLine("'Value' = {0}", s);
		}
		ICollection keyColl = htTest.Keys;
		Console.WriteLine();
		foreach( string s in keyColl )
		{
			Console.WriteLine("'Key' = {0}", s);
		}
		Console.WriteLine("nRimuovo elemento con chiave = 'doc'");
		htTest.Remove("doc");
		if (!htTest.ContainsKey("doc"))
		{
			Console.WriteLine("L'elemento con chiave = 'doc' non esiste.");
		}
	}
}