using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public class DataItem

        {

            public string Label { get; set; }

            public string Value { get; set; }

        }

    public static void Main()

    {

        List<DataItem> yy = null;

        var fix = yy?.Any(x => x.Label == "dd") ?? false;

        Console.WriteLine(fix);

        var error = (bool)yy?.Any(x => x.Label == "dd");

    }

}