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Code
class Program
{
    static void Main(string[] args)
     {
         Sample1.M1(new OrdinaryPeople("ZhangSan"));
         Sample1.M1(new Superman("Hancock"));
         Console.Read();
     }
}
class Sample1
{
    public static void M1(Person p)
     {
         p.Introdce();
     }
}
class Person
{
    protected string mName;
    public Person(string pName)
     {
        this.mName = pName;
     }
    public virtual void Introdce()
     {
         Console.WriteLine("Hello,I am " + this.mName);
     }
}
class OrdinaryPeople : Person
{
    public OrdinaryPeople(string pName)
         : base(pName)
     {
     }
    public new void Introdce()
     {
         Console.WriteLine("Hello,I am an ordinary person," + this.mName);
     }
}
class Superman : Person
{
    public Superman(string pName)
         : base(pName)
     {
     }
    public new void Introdce()
   &


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  using System;
using System.Collections;
namespace Ahnlab.ApplicationServices
{
public sealed partial class SysEnums
{


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3.ÔÚ as ºÍ Ç¿ÖÆÀàÐÍת»»Ö®¼ä£¬ÓÅÏÈʹÓà as ²Ù×÷·û
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using System.Threading;
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    private void SetPageNoCache()
        {
            Response.Buffer = true;
            Response.ExpiresAbsolute = Sy ......

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace ThreeTorches
{
    public struct Copydatastru ......
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