How to update or rewrite xml file according to changes in DataGridView

Question

C# winforms
I filled my DataGridView (dgv01) with xml nodes, like that:

foreach (XmlNode node1 in node.ChildNodes)

{

   if (node1.Name == "abc")

   {

      dgv01.Rows.Add(node1.InnerText, node1.ChildNodes[0].InnerText, node1.ChildNodes[1].InnerText);

Then I made some changes on dgv - add-delete rows, change content etc.
Is there a way to update or completely rewrite my xml file according to changes in dgv.
Thanks in advance.