Decimal.Round Method (Decimal)
Rounds a decimal value to the nearest integer.
Assembly: mscorlib (in mscorlib.dll)
Parameters
 d

Type:
System.Decimal
A decimal number to round.
Return Value
Type: System.DecimalThe integer that is nearest to the d parameter. If d is halfway between two integers, one of which is even and the other odd, the even number is returned.
Exception  Condition 

OverflowException  The result is outside the range of a Decimal value. 
The behavior of this method follows IEEE Standard 754, section 4. This kind of rounding is sometimes called round half to even or banker's rounding. It minimizes rounding errors that result from consistently rounding a midpoint value in a single direction. It is equivalent to calling the Round(Decimal, MidpointRounding) method with a mode argument of MidpointRounding.ToEven.
The following example rounds a range of Decimal values between 100 and 102 to the nearest integer. Because the method uses banker's rounding, note that 100.5 rounds to 100 and 101.5 rounds to 102.
Module Example Public Sub Main() For value As Decimal = 100d To 102d Step .1d Console.WriteLine("{0} > {1}", value, Decimal.Round(value)) Next End Sub End Module ' The example displays the following output: ' 100 > 100 ' 100.1 > 100 ' 100.2 > 100 ' 100.3 > 100 ' 100.4 > 100 ' 100.5 > 100 ' 100.6 > 101 ' 100.7 > 101 ' 100.8 > 101 ' 100.9 > 101 ' 101.0 > 101 ' 101.1 > 101 ' 101.2 > 101 ' 101.3 > 101 ' 101.4 > 101 ' 101.5 > 102 ' 101.6 > 102 ' 101.7 > 102 ' 101.8 > 102 ' 101.9 > 102 ' 102.0 > 102
Available since 2.0