There are two ways to round a number using the Math.Round method in .NET 2.0:

·         MidPointRounding.AwayFromZero - When a number is halfway between two others, it is rounded toward the nearest number that is away from zero.

·         MidPointRounding.ToEven - When a number is halfway between two others, it is rounded toward the nearest even number. 

MidPointRounding.ToEven is the DEFAULT!

This means that:

Math.Round(4.5) will return 4

Match.Round(5.5) will return 6

HUH?

My old math -- would expect the following results:

4.5 -> 5

5.5 -> 6

In order to get my expected results, the following calls need to be made:

Math.Round(4.5, MidPointRounding.AwayFromZero) will return 5

Math.Round(5.5, MidPointRounding.AwayFromZero) will return 6

According to the doc, the ToEven is the IEEE standard. I guess I know I am old when rounding no longer works as I would expect, unless I was sleeping during that class...