Best way to parse float?

string s = "123,456.789";
        float f = float.Parse(s, CultureInfo.InvariantCulture);

Double number = Double.Parse("42,22", new CultureInfo("nl-NL").NumberFormat); // dutch number formatting

string strFloat = (15.789f).ToString( System.Globalization.CultureInfo.InvariantInfo );
float numFloat = float.Parse( System.Globalization.CultureInfo.InvariantInfo, strFloat );
string strNow = DateTime.Now.ToString( System.Globalization.CultureInfo.InvariantInfo );
DateTime now = DateTime.Parse( System.Globalization.CultureInfo.InvariantInfo, strNow );