Using Datatable In Select Statement?

I have records in the datatable which I have retreived from xml file.

Dim docDataSet As New DataSet
Dim docReader As New XmlDocument
Dim xnl As XmlNodeList
docReader.Load("UserProfile.xml")
xnl = docReader.SelectNodes("/Users/user")
For Each xn As XmlNode In xnl
Dim xr As New XmlNodeReader(xn)
docDataSet.ReadXml(xr)
Next xn
Dim Dm_table As DataTable = ds.tables(0)

Now what I want to do is execute a select query like below:

Select * from user where userid in (select ID from Dm_table)

Retreive the records from the User table based on the ID's in the datatable.