XmlDataDocument Class

Any word on what we should use instead now it's obsolete?

I would recommend using XDocument (http://msdn.microsoft.com/en-us/library/system.xml.linq.xdocument.aspx).

I see the replacement is WriteXml, but the problem I have is that WriteXml just creates the file and places it in a specified location. In my app I was using XmlDataDocument to create the file and then give the user the save Dialog box so that they could open the file or save it to a location of their choosing. here is the code I was using.

Dim xmlDoc As System.Xml.XmlDataDocument
Dim xmlDec As System.Xml.XmlDeclaration
Dim xmlWriter As System.Xml.XmlWriter
Response.ClearContent()
Response.AddHeader("content-disposition", "attachment; filename=" + filename + ".xml")
Response.ContentType = "application/vnd.xml"
Response.Charset = "utf-8"
xmlWriter = New System.Xml.XmlTextWriter(Me.Response.OutputStream, System.Text.Encoding.UTF8)
xmlDoc = New System.Xml.XmlDataDocument(ds)
xmlDoc.DataSet.EnforceConstraints = False
xmlDec = xmlDoc.CreateXmlDeclaration("1.0", "UTF-8", Nothing)
xmlDoc.PrependChild(xmlDec)
xmlDoc.WriteTo(xmlWriter)
xmlWriter.Flush()
xmlWriter.Close()

How do I use ds.WriteXml to have that same functionality

It looks like the replacement would be the

WriteXml method of DATASET

Dim CryptoData As System.Data.DataSet = New System.Data.DataSet

Dim sCommand As String = "SELECT [USER_ID], [PUBLIC_KEY] FROM [CVS_OfficeDB].[dbo].[CVS_OFFICE_KEYS] "
Console.WriteLine("Creating an Adapter to load the DataSet.")
tmpDataAdapter = New System.Data.SqlClient.SqlDataAdapter(sCommand, tmpSqlConnection)
'Fill the DataSet with the selected records.
tmpDataAdapter.Fill(CryptoData, "CVS_OFFICE_KEYS")
CryptoData.WriteXml("C:\Documents and Settings\wymand\My Documents\Visual Studio 2010\Projects\Crypto_to_XML\CVS_Crypto_Users.XML", XmlWriteMode.IgnoreSchema)