Hashtable is a non-generic collection class, which stores data in the key, value pair of different datatype. hashtable is the same as the dictionary object, but the difference between hashtable and dictionary is, a hashtable is stores different datatype and dictionaries are stored the same type of data. Hashtable will provide lower performance because it supports the heterogeneous datatype.
Example
using System;
using System.Collections;
public class Program
{
public static void Main()
{
Hashtable htbl = new Hashtable();
htbl.Add(5,'Five');
htbl.Add(1,'One');
htbl.Add(2,'Two');
htbl.Add(3,'Three');
htbl.Add(4,'Four');
foreach(DictionaryEntry item in htbl)
Console.WriteLine('Key : ' + item.Key + ' Value : '+item.Value);
}
}
Output
Key : 5 Value : Five
Key : 4 Value : Four
Key : 3 Value : Three
Key : 2 Value : Two
Key : 1 Value : One
