# Enumerable.Max Method (IEnumerable(Of Nullable(Of Int64)))

.NET Framework (current version)

Returns the maximum value in a sequence of nullable Int64 values.

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

## Syntax

```<ExtensionAttribute>
Public Shared Function Max (
source As IEnumerable(Of Nullable(Of Long))
) As Nullable(Of Long)
```

#### Parameters

source
Type:

A sequence of nullable Int64 values to determine the maximum value of.

#### Return Value

Type:

A value of type Nullable<Int64> in C# or Nullable(Of Int64) in Visual Basic that corresponds to the maximum value in the sequence.

## Exceptions

Exception Condition
ArgumentNullException

source is null.

## Remarks

The Max(IEnumerable(Of Nullable(Of Int64))) method uses the Int64 implementation of IComparable(Of T) to compare values.

If the source sequence is empty or contains only values that are null, this function returns null.

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.

Note

This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. To extend the example to this topic, substitute the elements of the source sequence with elements of the appropriate numerical type.

```' 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

```

## Version Information

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
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