linq query to datatable error vb - vb.net

Question

I'm trying to send the results of a linq query to a new datatable. I will then use this datatable as a datasource for a datagridview. Aim being for edits made in datagridview to go back to the dataset and in turn to the xml. Followed this, here:
msdn guide
with this code:
Dim xmlFile As XmlReader
xmlFile = XmlReader.Create(My.Settings.CfgFile, New XmlReaderSettings())
Dim ds As New DataSet
_XMLRawDS.ReadXml(xmlFile)
Dim _XMLquery = From xmlsystem In _XMLRawDS.Tables("system").AsEnumerable()
Join xmlcontroller In _XMLRawDS.Tables("controller").AsEnumerable() On xmlsystem.Item("system_Id") Equals xmlcontroller.Item("system_Id")
Join xmlinput In _XMLRawDS.Tables("input").AsEnumerable() On xmlinput.Item("controller_Id") Equals xmlcontroller.Item("controller_Id")
Join xmlport In _XMLRawDS.Tables("port").AsEnumerable() On xmlport.Item("input_Id") Equals xmlinput.Item("input_Id")
Join xmlnewseq In _XMLRawDS.Tables("newseq").AsEnumerable() On xmlnewseq.Item("port_Id") Equals xmlport.Item("port_Id")
Select New With
{
.input = xmlsystem.Field(Of String)("Input"),
.name = xmlsystem.Field(Of String)("Name"),
.id = xmlcontroller.Field(Of String)("id"),
.type = xmlport.Field(Of String)("type"),
.newseqtext = xmlnewseq.Field(Of String)("newseq_Text")
}
Dim _XMLCtrlsDT As DataTable = _XMLquery.copytodatatable()
However, the last line won't compile due to:
'copytodatatable' is not a member of 'System.Collections.Generic.IEnumerable(Of <anonymous type>)'.
Looks pretty much the same as the msdn one to me, but sure there's something quietly at work.. Did take a look at this, but I'm damned if I could get it to work...
msdn-Implement CopyToDataTable Where the Generic Type T Is Not a DataRow
not even confident that's the issue..
The XML is as below:
<!--
Configuration Remap file
-->
<mameconfig version="10">
<!--
############################################################
Define controller aliases, This just makes the controller names
a little easier to deal with for the rest of the file.
############################################################
-->
<controlleralias>
<id>Ultimarc Ultra-Stik Player 1</id>
<alias>U360 Player1</alias>
</controlleralias>
<controlleralias>
<id>WingMan Extreme Digital 3D</id>
<alias>Flightstick</alias>
</controlleralias>
<controlleralias>
<id>HID#VID_061C_PID_AA00#7_35df86d5_0_0000#</id>
<alias>Lightgun1</alias>
</controlleralias>
<!--
############################################################
This is the System Default section
It generally should be the FIRST system section in the cfg file
############################################################
-->
<system name="default">
<!-- put a controller element here to have it copied into ONLY this particular
system element
-->
<controller id="U360 Player1">
<input>
<port type="P1_JOYSTICK_UP">
<newseq type="standard">JOYCODE_YAXIS_UP_SWITCH</newseq>
</port>
<port type="P1_JOYSTICK_DOWN">
<newseq type="standard">
JOYCODE_YAXIS_DOWN_SWITCH
</newseq>
</port>
</input>
</controller>
<controller id="Flightstick">
<input>
<port type="P1_SELECT">
<newseq type="standard">JOYCODE_BUTTON_7</newseq>
</port>
<port type="START1">
<newseq type="standard">JOYCODE_BUTTON8_SWITCH</newseq>
</port>
</input>
</controller>
<!-- this keyboard section provides a way to specify keyboard input
mappings that should ALSO be made for the specific port types. -->
<controller id="keyboard">
<input>
<port type="P1_JOYSTICK_UP">
<newseq type="standard">KEYCODE_UP</newseq>
</port>
<port type="P1_JOYSTICK_DOWN">
<newseq type="standard">KEYCODE_DOWN</newseq>
</port>
<port type="P1_JOYSTICK_LEFT">
<newseq type="standard">KEYCODE_LEFT</newseq>
</port>
<port type="P1_JOYSTICK_RIGHT">
<newseq type="standard">KEYCODE_RIGHT</newseq>
</port>
</input>
</controller>
<!--
###################################################
ACTUAL INPUT MAPPING STARTS HERE
DO NOT actually put anything in this section.
It is completely cleared and regenerated!
###################################################
-->
<input></input>
</system>
<!--
###################################################
This is a GAME specific section
Add additional <controller> sections here
to define how those controllers should map for this
particular game
###################################################
-->
<system name="ribbit">
<!-- This would be stupid to actually use, but as an example
For this game ("Ribbit"), reverse the UP and DOWN directions
on the joystick -->
<controller id="U360 Player1">
<input>
<port type="P1_JOYSTICK_UP">
<newseq type="standard">
JOYCODE_YAXIS_DOWN_SWITCH
</newseq>
</port>
<port type="P1_JOYSTICK_DOWN">
<newseq type="standard">
JOYCODE_YAXIS_UP_SWITCH
</newseq>
</port>
</input>
</controller>
<!--
###################################################
ACTUAL INPUT MAPPING STARTS HERE
DO NOT actually put anything in this section.
It is completely cleared and regenerated!
###################################################
-->
<input></input>
</system>
</mameconfig>
Which results in a Dataset of 7 tables (mameconfig, controlleralias, system,controller,input,port,newseq). All appear to have primary and foreign keys inserted by the import xml process.
Would appreciate any help. Really stuck on this one..