Creating a nullable extension method ,how do you do it?

Question

I have a situation where I need to compare nullable types.
Suppose you have 2 values:

int? foo=null;
int? bar=4;

This will not work:

<

Answer 1

It can be simplified:

public static bool IsLessThan(this T? one, T? other) where T : struct
{
    return Nullable.Compare(one, other) < 0;
}