using System;

public class Program

{

    public static void Main()

    {

        Exception s = new ArgumentException("test");

        Exception n = new NullReferenceException("Test2");

        Exception e = new Exception("test3");

        Console.WriteLine(s is ArgumentException or NullReferenceException ? "Hello" : "Bye");

        Console.WriteLine(n is ArgumentException or NullReferenceException ? "Hello" : "Bye");

        Console.WriteLine(e is ArgumentException or NullReferenceException ? "Hello" : "Bye");

        Test2<Test> t = new Test2<Test>();

        t.Delete("id1",null);

    }

}

public class Test

{

    public string id;

}

​

public class Test2<T>

{

    public string id;

    public void Delete(string id, T item)

    {

        if (typeof(T) != typeof(Test))

        {

            Console.WriteLine(typeof(T));

        }

        else

        {

            Console.WriteLine("Not matched");

        }

    }

}