集合是C#中一個重要的概念，下面給出一個集合拷貝的例子。

using System;
using System.Collections;
using System.Collections.Specialized;

namespace 集合的拷貝
{
 /// <summary>
 /// Class1 的摘要說明。
 /// </summary>
 class Class1
 {  
  [STAThread]
  static void Main(string[] args)
  {
   NameValueCollection namedVColl=new NameValueCollection();
   namedVColl.Add("曉華","13510532686");
   namedVColl.Add("曉華","62658888");
   namedVColl.Add("小楊","1361030486");
   namedVColl.Add("小楊","62293218");
   foreach(string key in namedVColl.Keys)
    Console.WriteLine("姓名={0}，電話={1}",key,namedVColl[key]);
   Console.WriteLine("拷貝后獲得的命名值集合");
   string[] arr=new string[namedVColl.Count];
   namedVColl.CopyTo(arr,0);
   for(int i=arr.GetLowerBound(0);i<arr.GetUpperBound(0);i++)
   {
    Console.WriteLine("姓名={0}，電話={1}",namedVColl.AllKeys[i],arr[i]);
   }
   Hashtable hhtable=new Hashtable();
   hhtable["曉華"]="北京";
   hhtable["小楊"]="南京";
   Console.WriteLine("克隆前哈希表");
   foreach(object key in hhtable.Keys)
    Console.WriteLine("姓名={0}，地址={1}",key,hhtable[key]);
   Hashtable hhCloned=(Hashtable)hhtable.Clone();
   hhtable["曉華"]="上海";
   Console.WriteLine("克隆修改初始化哈希表");
   foreach(object key in hhtable.Keys)
       Console.WriteLine("姓名={0}，地址={1}",key,hhtable[key]);
   Console.WriteLine("修改后初始化哈希表后的克隆哈薩克希表");
   foreach(object key in hhCloned.Keys)
   {
    Console.WriteLine("姓名={0}，地址={1}",key,hhCloned[key]);
   }
   Console.Read();
  }
 }
}