psh, clearly the best way to do it is this:
[code]
private static bool isLeapYear(){
return (new DateTime( DateTime.Now.Year, 3, 1, 0, 0, 0)).Subtract( new DateTime(DateTime.Now.Year, 2, 28, 0, 0, 0)).Hours == 48;
}
[/code]
edit - oops, had some things too java-y for c#
even tested in .NET fiddle