# Decimal.ToUInt64 Method (Decimal)

.NET Framework (current version)

Converts the value of the specified Decimal to the equivalent 64-bit unsigned integer.

This API is not CLS-compliant.

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

## Syntax

```<CLSCompliantAttribute(False)>
Public Shared Function ToUInt64 (
d As Decimal
) As ULong
```

#### Parameters

d
Type: System.Decimal

The decimal number to convert.

#### Return Value

Type: System.UInt64

A 64-bit unsigned integer equivalent to the value of d.

## Exceptions

Exception Condition
OverflowException

d is negative or greater than UInt64.MaxValue.

## Remarks

The return value is the integral part of the decimal value; fractional digits are truncated.

You can also convert a Decimal value to an 64-bit unsigned integer by using the Narrowing(Decimal to UInt64) assignment operator. Because the operator performs a narrowing conversion, you must use a casting operator in C# or a conversion function in Visual Basic.

## Examples

The following example uses the ToUInt64 method to convert decimal numbers to UInt64 values.

```Module Example
Public Sub Main()
Dim values() As Decimal = { 123d, New Decimal(123000, 0, 0, false, 3),
123.999d, 18446744073709551615.999d,
18446744073709551616d, 9223372036854775807.999d,
9223372036854775808d, -0.999d, -1d,
-9223372036854775808.999d,
-9223372036854775809d }

For Each value In values
Try
Dim number As ULong = Decimal.ToUInt64(value)
Console.WriteLine("{0} --> {1}", value, number)
Catch e As OverflowException
Console.WriteLine("{0}: {1}", e.GetType().Name, value)
End Try
Next
End Sub
End Module
' The example displays the following output:
'     123 --> 123
'     123.000 --> 123
'     123.999 --> 123
'     18446744073709551615.999 --> 18446744073709551615
'     OverflowException: 18446744073709551616
'     9223372036854775807.999 --> 9223372036854775807
'     9223372036854775808 --> 9223372036854775808
'     -0.999 --> 0
'     OverflowException: -1
'     OverflowException: -9223372036854775808.999
'     OverflowException: -9223372036854775809
```

## Version Information

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1