#region .ctor
static Pair() {
	theHashCode = typeof( Pair<TFirst, TSecond> ).AssemblyQualifiedName.GetHashCode();
	unchecked {
		theHashCode += typeof( TFirst ).AssemblyQualifiedName.GetHashCode();
		theHashCode += typeof( TSecond ).AssemblyQualifiedName.GetHashCode();
	}
}

protected Pair() : base() {
	myHashCode = theHashCode;
}
public Pair( TFirst first, TSecond second ) : this() {
	myFirst = first;
	mySecond = second;
	unchecked {
		if ( null != first ) {
			myHashCode += first.GetHashCode();
		}
		if ( null != second ) {
			myHashCode += second.GetHashCode();
		}
	}
}
#endregion .ctor