ARTICLE

Delete XML Element Data

Posted by Vijay Prativadi Articles | XML October 17, 2012
Today, in this article let’s play around with one of the interesting and most useful concepts in XML in C#.
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Introduction
 

Today, in this article let's play around with one of the interesting and most useful concepts in XML in C#.

Question: What is deleting XML Element Data?

In simple terms "It provides flexibility to delete out the element data from XML and binds the data into grid."

Step 1: Create a new webform project 

Output1.jpg
 

Step 2: The complete code of Employee.xml looks like this

 

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

<Employees>

  <Employee>

    <Id>1</Id>

    <FirstName>Vijay</FirstName>

    <LastName>Prativadi</LastName>

    <Age>26</Age>

  </Employee>

  <Employee>

    <Id>2</Id>

    <FirstName>Sandeep</FirstName>

    <LastName>Reddy</LastName>

    <Age>28</Age>

  </Employee>

</Employees>

 

Step 3: The complete code of webform1.aspx looks like this

 

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="DeleteXMLNodeApp._Default" %>

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1" runat="server">

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <center>

        <div>

            <table>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Label ID="Label1" runat="server" Text="Delete XML Element Data" Font-Bold="true"

                            Font-Size="Large" Font-Names="Verdana" ForeColor="Maroon"></asp:Label>

                    </td>

                </tr>

                <tr>

                    <td>

                        <asp:Label ID="Label6" runat="server" Text="Please Enter Id" Font-Size="Large" Font-Names="Verdana"

                            Font-Italic="true"></asp:Label>

                    </td>

                    <td>

                        <asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Button ID="Button1" runat="server" Text="Delete XML Data" Font-Names="Verdana"

                            Width="213px" BackColor="Orange" Font-Bold="True" OnClick="Button1_Click" />

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <br />

                        <asp:GridView ID="GridView1" runat="server" BackColor="LightGoldenrodYellow" BorderColor="Tan"

                            BorderWidth="1px" CellPadding="2" EnableModelValidation="True" ForeColor="Black"

                            GridLines="None" AutoGenerateColumns="False">

                            <AlternatingRowStyle BackColor="PaleGoldenrod"></AlternatingRowStyle>

                            <FooterStyle BackColor="Tan"></FooterStyle>

                            <HeaderStyle BackColor="Tan" Font-Bold="True"></HeaderStyle>

                            <PagerStyle HorizontalAlign="Center" BackColor="PaleGoldenrod" ForeColor="DarkSlateBlue">

                            </PagerStyle>

                            <SelectedRowStyle BackColor="DarkSlateBlue" ForeColor="GhostWhite"></SelectedRowStyle>

                            <Columns>

                                <asp:BoundField DataField="Id" HeaderText="Emp Id" ReadOnly="true" />

                                <asp:BoundField DataField="FirstName" HeaderText="First Name" />

                                <asp:BoundField DataField="LastName" HeaderText="Last Name" />

                                <asp:BoundField DataField="Age" HeaderText="Age" />

                            </Columns>

                        </asp:GridView>

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Label ID="Label5" runat="server" Font-Bold="true" Font-Names="Verdana"></asp:Label>

                    </td>

                </tr>

            </table>

        </div>

    </center>

    </form>

</body>

</html>

 

Step 4: The complete code of webform1.aspx.cs looks like this

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Xml;

using System.Data;

namespace DeleteXMLNodeApp

{

    public partial class _Default : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            TextBox4.Focus();

        }

        protected void Button1_Click(object sender, EventArgs e)

        {

            if (string.IsNullOrEmpty(TextBox4.Text))

            {

                Label5.Text = "Please Enter Some Values"; Label5.ForeColor = System.Drawing.Color.Red;

            }

            else

            {

                XmlDocument document = new XmlDocument();

                document.Load(Server.MapPath("Employee.xml"));

                foreach (XmlNode objNode in document.SelectNodes("Employees/Employee"))if (objNode.SelectSingleNode("Id").InnerText == TextBox4.Text)objNode.ParentNode.RemoveChild(objNode);

                document.Save(Server.MapPath("Employee.xml"));

                GetData(); Label5.Text = "Data Deleted Successfully";

                Label5.ForeColor = System.Drawing.Color.Green;

                TextBox4.Text = string.Empty;

            }

        }

        protected void GetData()

        {

            XmlTextReader objTextReader = new XmlTextReader(Server.MapPath("Employee.xml"));

            XmlDataDocument objDocument = new XmlDataDocument();

            objDocument.DataSet.ReadXml(objTextReader, XmlReadMode.InferSchema);

            DataSet objDataSet = objDocument.DataSet;

            GridView1.DataSource = objDataSet;

            GridView1.DataBind();

        }

    }

}
 

Step 5: The output of the application looks like this:
 

delete-xml-data.png
 

Step 6: The data deleted output of the application looks like this:
 

xml-data.png
 

Step 7: The complete code of Employee.xml looks like this:
 

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

<Employees>

  <Employee>

    <Id>1</Id>

    <FirstName>Vijay</FirstName>

    <LastName>Prativadi</LastName>

    <Age>26</Age>

  </Employee>

</Employees>


I hope this article is useful for you.

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