请参见此答案 [ ^ ].

DataSet ds = new DataSet();
ds.ReadXml("xml file path");

/*
write you update,Add & Delete Code.
*/
ds.writeXML(path);

在下面检查我的答案:
面向初学者的XML [从XML生成Excel并从Excel生成XML [ ^ ]

Check My answers below:
XML for Beginners[^]
Generate Excel from XML and Generate XML from Excel[^]