<ExtensionAttribute> _
Public Shared Function Attributes ( _
    source As IEnumerable(Of XElement), _
    name As XName _
) As IEnumerable(Of XAttribute)

Dim source As IEnumerable(Of XElement)
Dim name As XName
Dim returnValue As IEnumerable(Of XAttribute)

returnValue = source.Attributes(name)

public static IEnumerable<XAttribute> Attributes(
    this IEnumerable<XElement> source,
    XName name
)

[ExtensionAttribute]
public:
static IEnumerable<XAttribute^>^ Attributes(
    IEnumerable<XElement^>^ source, 
    XName^ name
)

public static function Attributes(
    source : IEnumerable<XElement>, 
    name : XName
) : IEnumerable<XAttribute>

XElement xmlTree = new XElement("Root",
    new XAttribute("Att1", "content1"),
    new XAttribute("Att2", "content2"),
    new XElement("Child1",
        new XAttribute("Att1", "content3"),
        new XAttribute("Att2", "content4")
    ),
    new XElement("Child2",
        new XAttribute("Att1", "content5"),
        new XAttribute("Att2", "content6")
    )
);

IEnumerable<XAttribute> attList = from att in xmlTree.Elements().Attributes("Att1")
                                  select att;

foreach (XAttribute att in attList)
    Console.WriteLine(att);

Dim xmlTree As XElement = _
    <Root Att1="content1" Att2="content2">
        <Child1 Att1="content3" Att2="content4">
        </Child1>
        <Child2 Att1="content5" Att2="content6">
        </Child2>
    </Root>

Dim attList = From att In xmlTree.Elements.Attributes("Att1") _
                          Select att

For Each att As XAttribute In attList
    Console.WriteLine(att)
Next

Att1="content3"
Att1="content5"