// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002718/object-istypeof

​

// @nuget: Z.ExtensionMethods

using System;

public class Program

{

    public class Class1 { }

    public class DerivedC1 : Class1 { }

    public static void Main()

    {

        DerivedC1 objDerivedC1 = new DerivedC1();

        Class1 objClass1 = new Class1();

        //C# Extension Method: Object - IsTypeOf

        Console.WriteLine("objDerivedC1 is type of Class1: {0}", objDerivedC1.IsTypeOf(typeof(Class1)));

        Console.WriteLine("objClass1 is type of Class1: {0}", objClass1.IsTypeOf(typeof(Class1)));

    }

}