Grid view datatable to xml with custom xml nodes in between

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ASP.NET

C#3.5

The below i am Reading a large Xml file.reading xml node by node and each node displayed in different gird view as shown below so

DataSet ds1 = sourcetable("xmlnode");
        Session["GridView1"] =ds1.Tables[0];

        GridView1.DataSource = Session["GridView1"];
        GridView1.DataBind();

so but porblem is recreation the node in the xml which is created back from the datatable and i am reading as following

XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load(MapPath(Session["filepath"].ToString()));

        XmlElement newDept = xmlDoc.CreateElement("nodename");

        for (int i = 1; i <= n; i++)
        {
            DataTable dtab = Session["GridView" + i] as DataTable;
            dtab.TableName = "tablename";
           

            foreach (DataRow rw in dtab.Rows)
            {
                XmlElement nameNode = xmlDoc.CreateElement(rw[0].ToString());

                newDept.AppendChild(nameNode);

                nameNode.InnerText = rw[1].ToString();
                                
                xmlDoc.DocumentElement.InsertAfter(newDept,          xmlDoc.DocumentElement.LastChild);

                            

            }

        }

in above above we are getting the result as following

<nodename>
<node1>text<node1 />
<node2>text<node2 />
<node3>text<node3 />
<nodename>

so but i want to create new node in between as show below

<nodename>
<node1>text<node1 />
<newnode>
<node2>text<node2 />
<newnode />
<nodename1>
<node3>text<node3 />
<nodename1 />
<nodename>

so i want to insert the newnode in between newly created nodes so please given a solution for the above and its a web application and i am using asp.net C#

What I have tried:

for (int i = 1; i <= n; i++)
        {
            DataTable dtab = Session["GridView" + i] as DataTable;
            dtab.TableName = "tablename";
           

            foreach (DataRow rw in dtab.Rows)
            {
                XmlElement nameNode = xmlDoc.CreateElement(rw[0].ToString());

                newDept.AppendChild(nameNode);

                nameNode.InnerText = rw[1].ToString();
                                
                xmlDoc.DocumentElement.InsertAfter(newDept,          xmlDoc.DocumentElement.LastChild);

                            

            }

        }