using System;
using System.Collections.Generic;
using System.Linq;
 
namespace ConsoleApplication1
{
    class Program
    {
        public static void Main(string[] args)
        {
            var test = new MyClass ();
 
        }
 
        class MyClass
        {
            private static readonly char[] InvalidChars = new[] { '\\', '/' };
 
            public string Name { get; private set; }
 
            public MyClass()
            {
                Name = "SomeName";
                //this line throws ArgumentNullException 
                //for "source" parameter of Contains method
                var isValid = !Name.Any(x => InvalidChars.Contains(x));
                Console.WriteLine(isValid);
            }
 
        }
    }
}
 

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