Preferred way to format fractional numbers in C#

double myDouble1 = 0.32;
double myDouble2 = 321.5235;

var currentCulture = CultureInfo.InvariantCulture.Clone() as CultureInfo;
var numberFormat = currentCulture.NumberFormat;
numberFormat.NumberDecimalDigits = 2;

Console.WriteLine(myDouble1.ToString("F", numberFormat));
Console.WriteLine(myDouble2.ToString("F", numberFormat));