using System;

​

public class C {

    public C() {

        Console.WriteLine("test");

    }

    public void Init(int a) {}

}

​

public abstract class A {

    public abstract void foo<T>() where T : C, new();

}

​

public class B : A {

    public override void foo<T>() {

        var a = new T();

        a.Init(2);

    }

}

public class Program

{

    public static void Main()

    {

        new B().foo<C>();

    }

}