expression as type

expression is type? (type)expression : (type)null

// keyword as

using System;

class CSharpFriends
{
    // empty
}

class ASPDotNet
{
    // empty
}

public class Test
{
    public static void Main()
    {
        object[] myObjects = new object[5];

        myObjects[0] = new CSharpFriends();
        myObjects[1] = new ASPDotNet();
        myObjects[2] = "C# is fun!";
        myObjects[3] = 2002;
        myObjects[4] = 99.99;    // the lowest price is the law!

        for(int i = 0; i < myObjects.Length; i++)
        {
            string s = myObjects[i] as string;
            Console.Write("myObject[{i}]", i);

            if (s != null)
            {
                Console.WriteLine (" is ");
            }
            else
            {
                Console.WriteLine ("not a string");
            }

        }

        // pause console window
        Console.ReadLine();
    
    }

}