Here's some examples:

```
decimal a = 1.994444M;
Math.Round(a, 2); //returns 1.99
decimal b = 1.995555M;
Math.Round(b, 2); //returns 2.00
```

You might also want to look at bankers rounding / round-to-even with the following overload:

```
Math.Round(a, 2, MidpointRounding.ToEven);
```

There's more information on it here.

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