# Double.IsNegativeInfinity Method

Returns a value indicating whether the specified number evaluates to negative infinity.

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

## Syntax

``````Public Shared Function IsNegativeInfinity ( _
d As Double _
) As Boolean
``````
``````public static bool IsNegativeInfinity(
double d
)
``````

#### Return Value

Type: System..::.Boolean
true if d evaluates to NegativeInfinity; otherwise, false.

## Remarks

Floating-point operations return NegativeInfinity to signal an overflow condition.

## Examples

The following example illustrates the use of IsNegativeInfinity:

``````' This will return "True".
outputBlock.Text &= "IsNegativeInfinity(-5.0 / 0) = "
If Double.IsNegativeInfinity(-5 / 0) Then
outputBlock.Text &= "True." & vbCrLf
Else
outputBlock.Text &= "False." & vbCrLf
End If

...

If D > Double.MaxValue Then
outputBlock.Text &= "Your number is bigger than a double." & vbCrLf
End If

...

' This will equal Infinity.
outputBlock.Text &= "10.0 minus NegativeInfinity equals " + (10 - Double.NegativeInfinity).ToString() + "." & vbCrLf
``````
``````// This will return "true".
outputBlock.Text += String.Format("IsNegativeInfinity(-5.0 / 0) == {0}.", Double.IsNegativeInfinity(-5.0 / 0) ? "true" : "false") + "\n";

...

if (d > Double.MaxValue)
{
outputBlock.Text += "Your number is bigger than a double." + "\n";
}

...

// This will equal Infinity.
outputBlock.Text += String.Format("10.0 minus NegativeInfinity equals {0}.", (10.0 - Double.NegativeInfinity).ToString()) + "\n";
``````

## Version Information

#### Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

## Platforms

Windows Phone

#### Reference

Double Structure

System Namespace

IsInfinity

IsPositiveInfinity

PositiveInfinity

NegativeInfinity