Delete XML Element Data

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

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

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

<FirstName>Vijay</FirstName>

<LastName>Prativadi</LastName>

</Employee>

<FirstName>Sandeep</FirstName>

<LastName>Reddy</LastName>

</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">

</head>

<body>

<div>

<table>

<tr>

<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>

<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>

<br />

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

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

GridLines="None" AutoGenerateColumns="False">

</PagerStyle>

<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>

<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:

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

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

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

<FirstName>Vijay</FirstName>

<LastName>Prativadi</LastName>

</Employee>

</Employees>

I hope this article is useful for you.