parameter null validation

CheckNull.cs

// https://dev.to/callmewhy/yo-yo-check-null-320m
// replace == null with is null because the == operator can be overloaded.
internal static class ThrowIf
{
    public static class Argument
    {
        public static void IsNull<T>(T argument)
        {
            if (argument is null)
            {
                throw new ArgumentNullException(typeof(T).Name);
            }
        }
    }
}
public void DoSomething(Foo foo)
{
    ThrowIf.Argument.IsNull(foo);
}