How to "is" Keyword Using in C#

using System;
class BaseClass
{}
class DerivedClass: BaseClass
{}
class isKeywordUsing
{
    public static void Main()
    {
        BaseClass baseObject = new BaseClass();
        DerivedClass derivedObject = new DerivedClass();
        Console.WriteLine("baseObject is BaseClass Type: {0}", baseObject is BaseClass);
        Console.WriteLine("derivedObject is DerivedClass Type: {0}", derivedObject is DerivedClass);
        Console.WriteLine("baseObject is DerivedClass Type: {0}", baseObject is DerivedClass);
        Console.WriteLine("\nderivedObject is BaseClass Type: {0}", derivedObject is BaseClass);
    }
}