Victoria,

You need to use the DataSet.GetChanges() method. I typcially use two XML strings, one for changes and one for deleted rows (deleted rows need special processing). Something like this:

DataSet dsChanged = MyDataSet.GetChanges();
DataSet dsDeleted = MyDataSet.GetChanges(DataRowState.Deleted);

string ChangeXML = dsChanged.GetXML();
string DeleteXML = "";

if (dsDeleted != null)
{
    // The dsDeleted DataSet contains only the deleted rows.
    // However, the GetXML() method ignores deleted rows,
    // so you need to un-delete them first.
    dsDeleted.RejectChanges();
    DeleteXML = dsDeleted.GetXML();
}

~~Bonnie

>The WriteXml method wites the complete data to xml document.
>What about if I want to write only the changes?