using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main(string[] args)

    {

        var myClass = new List<TestClass> {

            new TestClass() { MyOtherObject = new OtherClass { Name = "Name" } },

            new TestClass() { MyOtherObject = new OtherClass { Name = "John" } },

            new TestClass() { MyOtherObject = new OtherClass { Name = null } },

            new TestClass() { MyOtherObject = null },

            new TestClass() { MyOtherObject = new OtherClass { Name = "Name" } }

        };

        var items = myClass.Where(x => x.MyOtherObject?.Name == "Name").ToList();

        foreach (var item in items)

        {

            Console.WriteLine(item.MyOtherObject.Name);

        }

    }

    public class TestClass

    {

        public OtherClass MyOtherObject {get;set;}

    }

    public class OtherClass

    {

        public string Name {get;set;}

    }

}