Null tests

AnoverVariant.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace NullTest
{
    class SomeClass
    {
    }
    class Program
    {
        static void Main(string[] args)
        {
            TestNullArgument(new SomeClass());
            TestNullArgument((SomeClass)null);
        }

        static void TestNullArgument(SomeClass arg)
        {
            bool isNull = arg == null;
            Console.WriteLine("Arg is null: {0}", isNull);
        }
    }
}

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace NullTest
{
    class SomeClass
    {
    }
    class Program
    {
        static void Main(string[] args)
        {
            TestNullArgument(new SomeClass());
            TestNullArgument();
/        }

        static void TestNullArgument(SomeClass arg = null)
        {
            bool isNull = arg == null;
            Console.WriteLine("Arg is null: {0}", isNull);
        }
    }
}