How to determine if a decimal/double is an integer?

How do I tell if a decimal or double value is an integer?

For example:

decimal d = 5.0; // Would be true
decimal f = 5.5; // Would be false

or

double d = 5.0; // Would be true
double f = 5.5; // Would be false

The reason I would like to know this is so that I can determine programmatically if I want to output the value using .ToString("N0") or .ToString("N2"). If there is no decimal point value, then I don’t want to show that.

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