Write to Xml File using Asp-C#

Question

I'm trying to store Some values to an xml file.I've already created an Xml file and trying to overwrite data. The code is given..

/*storepassword.cs *//

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;

public class StorePassword
{
    public StorePassword()
    {
    }
    public void  store(NewPassword nps)
    {
       XmlDocument XmlDoc = new XmlDocument();

       //XmlDoc.Load(@"Password.xml");
       XmlDoc.LoadXml("Password.xml");

       XmlNode root = XmlDoc.DocumentElement;
       XmlNode myNode1 = root.SelectSingleNode("UserName");
       XmlNode myNode2 = root.SelectSingleNode("PassWord");
       myNode1.Value = "sjn";
       myNode2.Value = "sjn123";
       XmlDoc.Save(@"Password.xml");
   }
}

//NewPassword.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class NewPassword
{

    public NewPassword()
    {

    }
    public string username{ get; set; }
    public string Password{ get; set; }
}

on button click..

NewPassword nps = new NewPassword();
nps.username = TxtUser.Text;
nps.Password = TxtNewPassword.Text;
StorePassword sp=new StorePassword();
sp.store(nps);

The existing Xml file contains the following..

<?xml version="1.0" encoding="utf-8"?>
<ROOT>
  <UserName>abc</UserName>
  <PassWord>123</PassWord>
</ROOT>

But it's not working..

Data at the root level is invalid. Line 1, position 1

this error occures..

Ichanged the code as XmlDoc.Load(@"Password.xml");

now error changed to

Root element is missing.

   Description: An unhandled exception occurred during the execution of the current web                  request. Please review the stack trace for more information about the error and where it   originated in the code. 

Exception Details: System.Xml.XmlException: Root element is missing.

why this happens?

LoadXml is for loading an xml document represented as text. You want to use Load instead (as in the commented line) — Simon Mourier
– Simon Mourier, Commented Nov 2, 2012 at 9:18
Means your document is empty. Just do a new XmlDocument() then — Simon Mourier
– Simon Mourier, Commented Nov 2, 2012 at 9:30
Like Simon said, Load is the method you should use. Can you post the full error message you get & where you get it? Also, try to take a look at this question. — kdrvn
– kdrvn, Commented Nov 2, 2012 at 9:36
@Sudheesh you xml file is empty..have you checked whether the xml is empty or contain the same format as shown above..check the xml file and the path you are referring to.. — Anirudha
– Anirudha, Commented Nov 2, 2012 at 9:41

Kelvin Trinh · Accepted Answer · 2012-11-02 09:34:32Z

Try using XML Serialization:

public static partial class ObjectXMLSerializer<T> where T : class
{
            private static void SaveToDocumentFormat(T serializableObject, System.Type[] extraTypes, string path, IsolatedStorageFile isolatedStorageFolder)
            {
                using (TextWriter textWriter = CreateTextWriter(isolatedStorageFolder, path))
                {
                    XmlSerializer xmlSerializer = CreateXmlSerializer(extraTypes);

                    //Cuong: set name space to null
                    XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
                    ns.Add("", "");
                    xmlSerializer.Serialize(textWriter, serializableObject, ns);
                }
            }
            public static void Save(T serializableObject, string path)
            {
                    SaveToDocumentFormat(serializableObject, null, path, null);
            }

}

Thura · Accepted Answer · 2012-11-02 09:31:33Z

0

When you load your Xml you need to use Server.MapPath . XmlDoc.LoadXml(Server.MapPath("Password.xml"));

answered Nov 2, 2012 at 9:31

Thura

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Comments

Rohit · Accepted Answer · 2012-11-02 09:59:38Z

0

delete

<?xml version="1.0" encoding="utf-8"?>

from

<?xml version="1.0" encoding="utf-8"?>
<ROOT>
  <UserName>abc</UserName>
  <PassWord>123</PassWord>
</ROOT>

I do not know why it works but we do that all the time in our code. And yes you should be using XmlDocument.Load not XmlDocument.LoadXml

answered Nov 2, 2012 at 9:59

Rohit

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