how to delete the xml file node dynamically in c#

Read the xml file.

This function is use for delete xml node dynamically.

    /// <summary>
    ///
    /// </summary>
    /// <param name="path">xml file path</param>
    /// <param name="tagname">root tagname</param>
    /// <param name="searchconditionAttributename">Search Attribute Name</param>
    /// <param name="searchconditionAttributevalue">Search Attribute Value</param>

    private static void DeleteXmlNode(string path, string tagname, string searchconditionAttributename, string searchconditionAttributevalue)
    {
        XmlDocument doc = new XmlDocument();
        doc.Load(path);
        XmlNodeList nodes = doc.GetElementsByTagName(tagname);\
       //XmlNodeList nodes = doc.GetElementsByTagName("user");
        foreach (XmlNode node in nodes)
        {
            foreach (XmlAttribute attribute in node.Attributes)
            {
                if ((attribute.Name == searchconditionAttributename) && (attribute.Value == searchconditionAttributevalue))
                //if ((attribute.Name == "name") && (attribute.Value == "aaa"))
                {
                    //delete.
                    node.RemoveAll();
                    break;
                }
            }
        }
        //save xml file.
        doc.Save(path);
    }
This function is use for edit node in xml.
  /// <summary>
    ///
    /// </summary>
    /// <param name="path">xml file path</param>
    /// <param name="tagname">root tagname</param>
    /// <param name="searchconditionAttributename">Search Attribute Name</param>
    /// <param name="searchconditionAttributevalue">Search Attribute Value</param>
    /// <param name="editAttributename">Edit Attribute Name</param>
    /// <param name="editAttributevalue">Edit Attribute Value</param>
    private static void EditXmlNode(string path, string tagname, string searchconditionAttributename, string searchconditionAttributevalue, string editAttributename, string editAttributevalue)
    {
        XmlDocument doc = new XmlDocument();
        doc.Load(path);
        XmlNodeList nodes = doc.GetElementsByTagName(tagname);
        // XmlNodeList nodes = doc.GetElementsByTagName("user");
        foreach (XmlNode node in nodes)
        {
            bool newnode = true;
            //Check attribute eixt which we want to edit.
            bool isEdit = false;
            foreach (XmlAttribute attribute in node.Attributes)
            {
                //if ((attribute.Name == "name") && (attribute.Value == "ddd"))
                if ((attribute.Name == searchconditionAttributename) && (attribute.Value == searchconditionAttributevalue))
                {
                    isEdit = true;
                }
                if (isEdit)
                {
                    // if (attribute.Name == "expireson")
                    if (attribute.Name == editAttributename)
                    {
                        //attribute.Value = "2011-12-28";
                        attribute.Value = editAttributevalue;
                        break;
                    }
                }
            }
            newnode = false;
        }
        //save xml file.
        doc.Save(path);
    }
I use following .xml file
<?xml version="1.0" encoding="utf-8"?>
<users>
  <user />
  <user name='aaa' password='111' status='0' expireson='2012-12-31' createdon='2011-05-31' />
  <user name='bbb' password='222' status='0' expireson='2012-12-31' createdon='2011-05-31'/>
  <user name='ccc' password='333' status='0' expireson='2011-12-31' createdon='2011-05-31'/>
  <user name='ddd' password='444' status='0' expireson='2011-12-31' createdon='2011-05-31'/>
</users>