XML processing instruction and Standalone property

[Chery]

I used dataset to merge 2 XML files having the same
structure. I managed to merge these 2 XML files but how
can I write a processing instruction to link the merged
file to the existing XSL document?

Before merging the merging, each XML file has a
processing instruction to link to XSL stylesheet. But
after the merging, I cann't specify the standalone
property and processing instruction.

This is how I merge 2 XML files:
ds1.Merge(ds2, True)
ds1.WriteXml(OutputFileName, XmlWriteMode.IgnoreSchema)

How should I do so that the Output file will have the
processing instruction and set the standalone to False?
Please HELP......... TQ.

[mega]

Sorry but it's only possible with System.Xml.XmlDeclaration and you don't have that in ADO.NET. If its very importent you can write a small XSLT script that will do. But normally this is not an issue because you can read the XSD file and the XML file together into the DataTable/DataSet like this:
DataSet.ReadXmlSchema(yourXSDfile);
DataSet.ReadXml(yourXMLfile);