Hi Stephane,

You are actually trying to update an updategram instead of a diffgram. To update this, you need to install the the SqlXml 3.0 package and use the SqlXMLCommand object.

Here is some sample code on how to use this in ADO.NET:

SqlXmlCommand objSXC = new SqlXmlCommand("Driver={SQL
Server};Server=MyServer;Database=MyDatabase;Uid=MyUser; Pwd=MyPassword;");

objSXC.CommandType = SqlXmlCommandType.UpdateGram;

objSXC.CommandText = MyXMLstring;

objSXC.ExecuteNonQuery ();

Here is the link to download SqlXml 3.0:

http://msdn.microsoft.com/downloads/default.asp?url=/downloads/sample.asp?url=/msdn-files/027/001/824/msdncompositedoc.xml

>How do i save a Diffgram back to SQL Server using ADO.NET and C#? Here is the diffgram i want to save:
>
>

>
><?xml version = "1.0" encoding="Windows-1252" standalone="yes"?>
><root xmlns:updg="urn:schemas-microsoft-com:xml-updategram">
>	<updg:sync>
>		<updg:before>
>			<testtable>
>				<descr>BEFORE CHANGE</descr>
>				<identity_column>5</identity_column>
>			</testtable>
>		</updg:before>
>		<updg:after>
>			<testtable>
>				<descr>AFTER CHANGE</descr>
>				<identity_column>5</identity_column>
>			</testtable>
>		</updg:after>
>	</updg:sync>
></root>
>
>