Well, actually this is not really a bug, but a very strange behavior of the .NET double type. I'll put it as a riddle and let you find it out ! Ok, if no one found it, I'll post the answer, over a couple of days, time to let you search... ;) Take the following method:

public static string LittleTest(double a, double b)
{
double x = 5.0;

if (a != b)
	return "Try other values for a and b...";

double xa = x / a;
double xb = x / b;

if (xa == xb)
	return "Not yet right...";
else
	return "You've got it !!!";

}

For which values a and b will the method return "You've got it !!!" ???