Test if a floating point number is an integer

Question

This code works (C# 3)

double d;
if(d == (double)(int)d) ...;

1. Is there a better way to do this?
2. For extraneous reasons I want to

Answer 1

If your double is the result of another calculation, you probably want something like:

d == Math.Floor(d + 0.00001);

That way, if there's been a slight rounding error, it'll still match.