How do I round down a decimal to 2 decimal places in .Net?

Question

This should be easy, but I can’t find a built in method for it, the .net framework must have a method to do this!

private decimal RoundDownTo2DecimalPlaces(decimal input)
{
   if (input < 0)
   {
      throw new Exception("not tested with negitive numbers");
   }

   // There must be a better way!
   return Math.Truncate(input * 100) / 100;
}

Answer 1

Math.Floor(number * 100) / 100;

Answer 2

If you are rounding down then you need:

Math.Floor(number * 100) / 100;

if you are looking for something called 'bankers rounding' (probably not if it's for output and not for statistics/summing) then:

Math.Round(number, 2);

Finally if you want, not sure what the correct term is, 'normal rounding':

Math.Round(number, 2, MidpointRounding.AwayFromZero);