xml and .net

try this:

XmlDocument doc = new XmlDocument();
            doc.Load(@"your path here");
            XmlNode childNode = doc.SelectSingleNode("/Quotes/Quote/ID"); 
            XmlNode pnode = childNode.ParentNode;
            childNode.ParentNode.RemoveChild(childNode);
            XmlNode new_node = doc.CreateElement("GenericInfo");
            new_node.AppendChild(childNode);
            pnode.AppendChild(new_node);
            doc.Save(@"your path here");

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what if below:

<Quotes>
  <Quote>
    <GenericInfo>
    <ID>61c6a1d9-bb7a-4525-880c-81e7eaae284e</ID>
    </GenericInfo>
    <OtherInfo>
     <ID>32434A</ID>
    </OtherInfo>
  </Quote>
</Quotes>

I will have more than one

And please try to use my codes to modify.

That was not the original question. Also you did not post the complete code. Where do you call your Save method? Where is class generic defined? Does AddChild belongs to that class?  Otherwise I did give you a solution to your question. It words and you can easily change the code to fit in your class

 public void AddChild(XmlDocument doc, XmlNode parentNode, string elementName, string value)
        {
            XmlNode node = doc.CreateElement(elementName);
            node.InnerText = value;
            parentNode.AppendChild(node);

        }

        public  bool Save(string fileLocation)
        {
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(fileLocation);
                XmlNode childNode = doc.SelectSingleNode("/Quotes/Quote/ID"); // apply your xpath here
                XmlNode pnode = childNode.ParentNode;
                childNode.ParentNode.RemoveChild(childNode);
                XmlNode new_node = doc.CreateElement("GenericInfo");
                new_node.AppendChild(childNode);
                pnode.AppendChild(new_node);
                XmlNode other_node = doc.CreateElement("OtherInfo");
                AddChild(doc, pnode.AppendChild(other_node), "ID", "ABC");
                doc.Save(fileLocation);
                return true;
            }
            catch (Exception ex)
            {
                Console.Write(ex.Message);
                return false;
            }

        }

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YZlat: Your codes is ended up return False. it is not working

I tested it and it worked for me. the problem is that you did not post all your code. If you do, I can help you fix it

As I told you. it is not working

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml;

namespace Web01
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

            Response.Write(Save2(@"I:\My Hard Drive\Projects\InsurSol\Data\Quote.xml"));
     
        }

        public void AddChild(XmlDocument doc, XmlNode parentNode, string elementName, string value)
        {
            XmlNode node = doc.CreateElement(elementName);
            node.InnerText = value;
            parentNode.AppendChild(node);

        }

        public bool Save2(string fileLocation)
        {
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(fileLocation);
                XmlNode childNode = doc.SelectSingleNode("/Quotes/Quote"); // apply your xpath here
                XmlNode pnode = childNode.ParentNode;
                childNode.ParentNode.RemoveChild(childNode);
                XmlNode new_node = doc.CreateElement("GenericInfo");
                new_node.AppendChild(childNode);
                pnode.AppendChild(new_node);
                XmlNode other_node = doc.CreateElement("OtherInfo");
                AddChild(doc, pnode.AppendChild(other_node), "ID", "ABC");
                doc.Save(fileLocation);
                return true;
            }
            catch (Exception ex)
            {
                Console.Write(ex.Message);
                return false;
            }

        }

    }
}

OK, now I see what the problem is - you are using a web application. I did it with windows app. The code is correct and if you run your web application from your computer, it works. It worked for me when I copied the code you used. The problem is that when application is on web server and the XML file you are trying to modify is not local to application (is not on the same physical server), it will not work. That's just how it is for security reason - so that web apps cannot modify files on your hard drive

An entire codes are in my computer. not a server. and it returns false. everything include the xml is in  the same directory. there is no security reason.

Can you give me copy of your file? Perhaps the key to the problem is the file itself