OK, this worked well.

private void button4_Click(object sender, EventArgs e)
        {
            XDocument doc = XDocument.Load(@"c:\iloconf.xml");
            XElement mns = 
doc.Descendants("MOD_NETWORK_SETTINGS").FirstOrDefault();
            if (mns != null)
            {
                XElement ipadd = mns.Element("IP_ADDRESS");
                ipadd.SetAttributeValue("VALUE", textBox1.Text);

                XElement subnet = mns.Element("SUBNET_MASK");
                subnet.SetAttributeValue("VALUE", textBox2.Text);

                XElement gateway = mns.Element("GATEWAY_IP_ADDRESS");
                gateway.SetAttributeValue("VALUE", textBox3.Text);

                XElement dname = mns.Element("DNS_NAME");
                dname.SetAttributeValue("VALUE", textBox4.Text);
                // make more changes here
                // then save
                doc.Save(@"c:\iloconf.xml");
            }
         }

Now how would I handle setting the passwords on each of the three users? I 
wouldn't be able to use the statement:
 XElement ui = doc.Descendants("USER_INFO").FirstOrDefault();

I would have to identify which ADD_USER under the USER_INFO element.

Thanks,
Ron

"Martin Honnen" wrote:

> RLEE71 wrote:
> > I'm using VS C# 2008 Express. I want to read data from an XML file and 
> > display into a text box. I then want to be able to edit the data in the text 
> > box and save back to the XML file. I've seen various examples of how to do 
> > this, but I think that my particular XML file is more complicated. Any help 
> > would be greatly appreciated. I'm concerned with the data in the IP_ADRESS, 
> > SUBNET_MASK, GATEWAY_IP_ADRESS, and DNS_NAME tags under MOD_NETWORK_SETTINGS. 
> > Also want to edit the ADD_USER PASSWORD data.
> 
> With VS 2008 you can and should use LINQ to XML to manipulate your XML:
> http://msdn.microsoft.com/en-us/library/bb387098.aspx
> 
> Here is sample code that loads your XML sample, finds the 
> MOD_NETWORK_SETTINGS element and changes the VALUE attribute of the 
> DNS_NAME child element:
> 
>              XDocument doc = XDocument.Load(@"doc.xml");
>              XElement mns = 
> doc.Descendants("MOD_NETWORK_SETTINGS").FirstOrDefault();
>              if (mns != null)
>              {
>                  XElement dname = mns.Element("DNS_NAME");
>                  dname.SetAttributeValue("VALUE", "foo");
>                  // make more changes here
>                  // then save
>                  doc.Save("doc.xml");
>              }
> 
> -- 
> 
> 	Martin Honnen --- MVP XML
> 	http://JavaScript.FAQTs.com/
>