Insert, Update, Delete in List view XML in Asp.net c sharp

==========================Employee.xml=========
<?xml version="1.0" encoding="utf-8"?>
<NewElement>
  <Employee>
    <ID>1</ID>
    <Name>pramod s r</Name>
  </Employee>
  <Employee>
    <ID>2</ID>
    <Name>koli</Name>
  </Employee>
  <Employee>
    <ID>3</ID>
    <Name>xyz</Name>
  </Employee>
  <Employee>
    <ID>4</ID>
    <Name>sdfsdf</Name>
  </Employee>
</NewElement>
==============================Design=============================
<asp:ListView ID="lvEmployee" runat="server" InsertItemPosition="LastItem" OnItemInserting="lvEmployee_ItemInserting"
            OnItemDeleting="lvEmployee_ItemDeleting" OnItemEditing="lvEmployee_ItemEditing"
            OnItemCanceling="lvEmployee_ItemCanceling" >
            <LayoutTemplate>
                <table id="Table1" runat="server">
                    <tr id="Tr1" runat="server">
                        <td id="Td1" runat="server">
                            <table id="itemPlaceholderContainer" runat="server" border="0" style="">
                                <tr id="Tr2" runat="server" style="">
                                    <th id="Th1" runat="server">
                                    </th>
                                    <th id="Th2" runat="server">
                                        ID
                                    </th>
                                    <th id="Th3" runat="server">
                                        Name
                                    </th>
                                </tr>
                                <tr id="itemPlaceholder" runat="server">
                                </tr>
                            </table>
                        </td>
                    </tr>
                    <tr id="Tr3" runat="server">
                        <td id="Td2" runat="server" style="">
                        </td>
                    </tr>
                </table>
            </LayoutTemplate>
            <ItemTemplate>
                <tr style="">
                    <td>
                        <asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Text="Delete" />
                        <asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
                    </td>
                    <td>
                        <asp:Label ID="lblID" runat="server" Text='<%# Bind("ID") %>' />
                    </td>
                    <td>
                        <asp:Label ID="lblName" runat="server" Text='<%# Bind("Name") %>' />
                    </td>
                </tr>
            </ItemTemplate>
            <InsertItemTemplate>
                <tr style="">
                    <td>
                        <asp:Button ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" />
                        <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Clear" />
                    </td>
                    <td>
                       
                    </td>
                    <td>
                        <asp:TextBox ID="txtID" runat="server" Text='<%# Bind("ID") %>' />
                    </td>
                    <td>
                        <asp:TextBox ID="txtName" runat="server" Text='<%# Bind("Name") %>' />
                    </td>
                    <td>
                        <asp:Button ID="btnUpdate" runat="server" Text="Update" OnClick="btnUpdate_Click" />
                    </td>
                </tr>
            </InsertItemTemplate>
        </asp:ListView>
==================================Code======================
using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Xml;

public partial class Listview_XML : System.Web.UI.Page
{
    //Global varaiable declaration
    string xmlfile = @"E:\Employee.xml";

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            LoadData();
        }

    }
    //Loading the data from xml file
    protected void LoadData()
    {
        DataSet ds = new DataSet();
        DataTable table = new DataTable();
        //reading xml file and loading listview.
        ds.ReadXml(xmlfile);
        lvEmployee.DataSource = ds;
        //binding dataset to listview.
        lvEmployee.DataBind();
    }

    // onclick of insert button in listview

    protected void lvEmployee_ItemInserting(object sender, ListViewInsertEventArgs e)
    {
        TextBox txtidTextBox = (TextBox)lvEmployee.InsertItem.FindControl("txtID");
        TextBox txtnameTextBox = (TextBox)lvEmployee.InsertItem.FindControl("txtName");
        // loading xml file
        XmlDocument xdoc = new XmlDocument();
        xdoc.Load(xmlfile);

        //Creating childnode to root node using Xmlelement
        XmlElement xelement = xdoc.CreateElement("Employee");
        //creating subnode to childnode using XmlElement
        XmlElement xID = xdoc.CreateElement("ID");
        xID.InnerText = txtidTextBox.Text;
        xelement.AppendChild(xID);

        //creating subnode to childnode using XmlElement
        XmlElement xName = xdoc.CreateElement("Name");
        xName.InnerText = txtnameTextBox.Text;
        xelement.AppendChild(xName);

        //Adding childnode to the root node.(in my case "NewElement is root node")
        xdoc.DocumentElement.AppendChild(xelement);
        xdoc.Save(xmlfile);
        LoadData();
    }

    // onclick of edit button in listview

    static Int16 i = 0;// based on the requirement we can change the declaration of variable i.

    protected void lvEmployee_ItemEditing(object sender, ListViewEditEventArgs e)
    {
        //getting the index value of particular row on click of edit button
        lvEmployee.EditIndex = e.NewEditIndex;
        i = Convert.ToInt16(lvEmployee.EditIndex);

        // to get the values from label which is inside listview, we need FindControl
        Label lblid = (Label)lvEmployee.EditItem.FindControl("lblID");
        Label lblname = (Label)lvEmployee.EditItem.FindControl("lblName");

        // to get the values from textbox which is inside listview, we need FindControl
        TextBox txtidTextBox = (TextBox)lvEmployee.InsertItem.FindControl("txtID");
        TextBox txtnameTextBox = (TextBox)lvEmployee.InsertItem.FindControl("txtName");
        txtidTextBox.Text = lblid.Text;
        txtidTextBox.Visible = false;
        txtnameTextBox.Text = lblname.Text;

    }

    protected void lvEmployee_ItemDeleting(object sender, ListViewDeleteEventArgs e)
    {
        // to get the values from label which is inside listview, we need FindControl
        Label lbl = (lvEmployee.Items[e.ItemIndex].FindControl("lblID")) as Label;
        Label lblName = (lvEmployee.Items[e.ItemIndex].FindControl("lblName")) as Label;
        //loading xml file using Xmldocument.
        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load(xmlfile);
        XmlNodeList newXMLNodes = xmlDoc.SelectNodes("/NewElement/Employee");

        // here i am searching based on id and name.So i am concatenating data into one string variable.
        string value = lbl.Text + lblName.Text;

        // code to remove child node from xml based on selection(matches all the data in xml file)
        //when a match is found removes that childnode from root node.
        foreach (XmlNode newXMLNode in newXMLNodes)
        {
            if (newXMLNode.InnerText == value)
            {
                newXMLNode.ParentNode.RemoveChild(newXMLNode);
            }
        }
        //saving back xml file and reloading listview.
        xmlDoc.Save(xmlfile);
        xmlDoc = null;
        LoadData();


    }

    protected void lvEmployee_ItemCanceling(object sender, ListViewCancelEventArgs e)
    {
        // to clear the textbox data.. (reset)
        TextBox txtidTextBox = (TextBox)lvEmployee.InsertItem.FindControl("txtID");
        TextBox txtnameTextBox = (TextBox)lvEmployee.InsertItem.FindControl("txtName");
        txtidTextBox.Text = string.Empty;
        txtnameTextBox.Text = string.Empty;
    }


    protected void btnUpdate_Click(object sender, EventArgs e)
    {
        try
        {
            // to get the values from label which is inside listview, we need FindControl
            Label lblid = (Label)lvEmployee.EditItem.FindControl("lblID");
            Label lblname = (Label)lvEmployee.EditItem.FindControl("lblName");
            // to get the values from textbox which is inside listview, we need FindControl
            TextBox txtidTextBox = (TextBox)lvEmployee.InsertItem.FindControl("txtID");
            TextBox txtnameTextBox = (TextBox)lvEmployee.InsertItem.FindControl("txtName");
            //loading xml file
            XmlDocument xmldoc = new XmlDocument();
            xmldoc.Load(xmlfile);

            // Index value will be obtained at lvEmployee_ItemEditing ,that index value
            //is used here for update.
            XmlNode xmlnode = xmldoc.DocumentElement.ChildNodes.Item(i);
            xmlnode["ID"].InnerText = lblid.Text;
            xmlnode["Name"].InnerText = txtnameTextBox.Text;
            // save xml file and reload listview.
            xmldoc.Save(xmlfile);
            LoadData();
        }
        catch
        {
        }
    }

}