DerivedClass.NonVirtualFunc C# (CSharp) Method

    public new string NonVirtualFunc(int n) {
        Console.WriteLine("DerivedClass.NonVirtualFunc: {0}", n*2);
        return "String returned from DerivedClass.NonVirtualFunc:" + n*2;
    }
}

    public static void Main() {

        BaseClass obj1=new BaseClass();
        CheckReturnedInt(obj1.F1("obj1"), 1);
        CheckReturnedString(obj1.F2("obj1"), "String returned from BaseClass.F2:obj1");
        CheckReturnedString(obj1.NonVirtualFunc(11), "String returned from BaseClass.NonVirtualFunc:11");
        Console.WriteLine("");

        DerivedClass obj2=new DerivedClass();
        CheckReturnedInt(obj2.F1("obj2"), 2);
        CheckReturnedString(obj2.F2("obj2"), "String returned from DerivedClass.F2:obj2");
        CheckReturnedString(obj2.NonVirtualFunc(15), "String returned from DerivedClass.NonVirtualFunc:30");
        Console.WriteLine("");

        BaseClass objectRef;
        objectRef = obj1;
        CheckReturnedInt(objectRef.F1("objectRef is now obj1"), 1);
        CheckReturnedString(objectRef.F2("objectRef is now obj1"), "String returned from BaseClass.F2:objectRef is now obj1");
        CheckReturnedString(objectRef.NonVirtualFunc(11), "String returned from BaseClass.NonVirtualFunc:11");
        Console.WriteLine("");

        objectRef = obj2;
        CheckReturnedInt(objectRef.F1("objectRef is now obj2"), 2);
        CheckReturnedString(objectRef.F2("objectRef is now obj2"), "String returned from DerivedClass.F2:objectRef is now obj2");
        CheckReturnedString(objectRef.NonVirtualFunc(15), "String returned from BaseClass.NonVirtualFunc:15");
        Console.WriteLine("");

        if (failed) {
             System.Environment.ExitCode = 1;
        }
        else {
             System.Environment.ExitCode = 0;
        }
        
    }