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# Enumerable.Max Method (IEnumerable(Of Nullable(Of Double)))

Visual Studio 2008

Returns the maximum value in a sequence of nullable Double values.

Namespace:  System.Linq
Assembly:  System.Core (in System.Core.dll)

## Syntax

```'Declaration
<ExtensionAttribute> _
Public Shared Function Max ( _
source As IEnumerable(Of Nullable(Of Double)) _
) As Nullable(Of Double)
'Usage
Dim source As IEnumerable(Of Nullable(Of Double))
Dim returnValue As Nullable(Of Double)

returnValue = source.Max()
```

#### Parameters

source
Type: System.Collections.Generic.IEnumerable(Of Nullable(Of Double))

A sequence of nullable Double values to determine the maximum value of.

#### Return Value

Type: System.Nullable(Of Double)
A value of type Nullable<Double> in C# or Nullable(Of Double) in Visual Basic that corresponds to the maximum value in the sequence.

#### Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable(Of Nullable(Of Double)). When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

## Exceptions

ExceptionCondition
ArgumentNullException

source is Nothing.

## Remarks

The Max(IEnumerable(Of Nullable(Of Double))) method uses the Double implementation of IComparable(Of T) to compare values.

If the source sequence is empty or contains only values that are Nothing, this function returns Nothing.

In Visual Basic query expression syntax, an Aggregate Into Max() clause translates to an invocation of Max.

## Examples

The following code example demonstrates how to use Max(IEnumerable(Of Nullable(Of Double))) to determine the maximum value in a sequence.

```' Create an array of Nullable Double values.
Dim doubles() As Nullable(Of Double) = _
{Nothing, 1.5E+104, 9.0E+103, -2.0E+103}

' Determine the maximum value in the array.
Dim max As Nullable(Of Double) = doubles.Max()

' Display the result.
MsgBox("The largest number is " & max)

' This code produces the following output:
'
' The largest number is 1.5E+104
```

## Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

## Version Information

#### .NET Framework

Supported in: 3.5

#### .NET Compact Framework

Supported in: 3.5

#### XNA Framework

Supported in: 3.0