Using typeof

// Demonstrate typeof.
//csc typeof_demo.cs
using System;
using System.IO;
class UseTypeof {
public static void Main() {
Type t = typeof(StreamReader);
Console.WriteLine(t.FullName);
if(t.IsClass) Console.WriteLine("Is a class.");
if(t.IsAbstract) Console.WriteLine("Is abstract.");
else Console.WriteLine("Is concrete.");
}
}