What data type should I use to represent money in C#?

In C#, what data type should I use to represent monetary amounts? Decimal? Float? Double? I want to take in consideration: precision, rounding, etc.

Use System.Decimal:

The Decimal value type represents decimal numbers ranging from positive 79,228,162,514,264,337,593,543,950,335 to negative 79,228,162,514,264,337,593,543,950,335. The Decimal value type is appropriate for financial calculations requiring large numbers of significant integral and fractional digits and no round-off errors. The Decimal type does not eliminate the need for rounding. Rather, it minimizes errors due to rounding.

Neither System.Single (float) nor System.Double (double) are precise enough capable of representing high-precision floating point numbers without rounding errors.

Use decimal and money in the DB if you're using SQL.

Decimal is the one you want.