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# Decimal.Round Method (Decimal, Int32, MidpointRounding)

.NET Framework 3.0
Rounds a decimal value to a specified precision. A parameter specifies how to round the value if it is midway between two other numbers.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

## Syntax

```public static decimal Round (
decimal d,
int decimals,
MidpointRounding mode
)
```
```public static Decimal Round (
Decimal d,
int decimals,
MidpointRounding mode
)
```
```public static function Round (
d : decimal,
decimals : int,
mode : MidpointRounding
) : decimal
```
```Not applicable.
```

#### Parameters

d

A decimal number to round.

decimals

The number of significant decimal places (precision) in the return value.

mode

A value that specifies how to round d if it is midway between two other numbers.

#### Return Value

The number that is nearest to the d parameter with a precision equal to the decimals parameter. If d is halfway between two numbers, one of which is even and the other odd, the mode parameter determines which of the two numbers is returned. If the precision of d is less than decimals, d is returned unchanged.

## Exceptions

Exception typeCondition

ArgumentOutOfRangeException

decimals is less than 0 or greater than 28.

ArgumentException

mode is not a System.MidpointRounding value.

OverflowException

The result is outside the range of a Decimal object.

## Remarks

The decimals parameter specifies the number of significant decimal places in the return value and ranges from 0 to 28. If decimals is zero, an integer is returned.

The behavior of this method follows IEEE Standard 754, section 4. This kind of rounding is sometimes called rounding to nearest or banker's rounding. If decimals is zero, this kind of rounding is sometimes called rounding toward zero.

## Platforms

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

## Version Information

#### .NET Framework

Supported in: 3.0, 2.0