C#

using System;
public class Test {
  public void SayTest() { Console.WriteLine("Test"); }
}

using System;
public class Hello { 
  public static void Main(String[] args) {
    new Test().SayTest();
  }
}

IEnumerator ie = anArrayList.GetEnumerator();
while(ie.MoveNext())
{
  MyClass myclass = ie.Current as MyClass;
  if( myclass != null )
  {
    DoStuff();
  }
  else
  {
    // the Current element is not a MyClass type.
  }
}

foreach (object obj in anArrayList)
{
    if (obj.GetType() == typeof(MyClass)
    {
         DoStuff();
    }
}

public class MyClass {}
public interface IMyInterface {}
 
public class Foo : MyClass {}
public class Bar : MyInterface {}
public class Baz : MyClass, IMyInterface {}
 
...
 
MyClass mc;
Foo foo;
Bar bar;
Baz baz;
 
mc is MyClass == true
mc is IMyInterface == false
 
foo is MyClass == true
foo is IMyInterface == false
 
bar is MyClass == false
bar is IMyInterface == true
 
baz is MyClass == true
baz is IMyInterface == true

class Player{}
class Dealer : Player {}
class Players : ArrayList {}

...

Players players = new Players();

void Method()
{
    foreach (Player player in players)
    {
        if (player is Dealer)
        {
            Dealer dealer = player as Dealer; 
            dealer.DoDealerStuff();
        }
    }
}

<br />
 if (player is Dealer)        <br />
{           <br />
    Dealer dealer = player as Dealer;             <br />
    dealer.DoDealerStuff();        <br />
}<br />

<br />
Dealer dealer = player as Dealer;<br />
if ( dealer != null ) {<br />
  dealer.DoStuff();<br />
}<br />