Add Attribute to XML Using LINQ to XML

Introduction

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

Question: What is adding attribute to XML using LINQ to XML?

In simple terms "It provides flexibility to add a new XAttribute to XML with help of a LINQ query."

Step 1: Create an "ASP.NET Web Application", as in:

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="WebForm1.aspx.cs" Inherits="LINQtoXMLAddAttributeApp.WebForm1" %>
<!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="Create Attribute using LINQ-to-XML" 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>
<td>
<asp:Label ID="Label7" runat="server" Text="Please Enter Attribute Value" Font-Size="Large"
Font-Names="Verdana" Font-Italic="true"></asp:Label>
</td>
<td>
<asp:TextBox ID="TextBox5" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label ID="Label2" runat="server" Text="Please Enter FirstName" Font-Size="Large"
Font-Names="Verdana" Font-Italic="true"></asp:Label>
</td>
<td>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label ID="Label3" runat="server" Text="Please Enter LastName" Font-Size="Large"
Font-Names="Verdana" Font-Italic="true"></asp:Label>
</td>
<td>
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label ID="Label4" runat="server" Text="Please Enter Age" Font-Size="Large" Font-Names="Verdana"
Font-Italic="true"></asp:Label>
</td>
<td>
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td colspan="2" align="center">
<asp:Button ID="Button1" runat="server" Text="Create Data" Font-Names="Verdana" Width="213px"
BackColor="Orange" Font-Bold="True" OnClick="Button1_Click" />
</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.Linq;
namespace LINQtoXMLAddAttributeApp
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(TextBox4.Text) || string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text) || string.IsNullOrEmpty(TextBox3.Text) || string.IsNullOrEmpty(TextBox5.Text))
{
Label5.Text = "Please Enter Some Values";
Label5.ForeColor = System.Drawing.Color.Red;
}
else
{
XDocument document = XDocument.Load(Server.MapPath("Employee.xml"));
document.Element("Employees").Add(new XElement("Employee", new XElement("Id", new XAttribute("Code", TextBox5.Text), TextBox4.Text), new XElement("FirstName", TextBox1.Text), new XElement("LastName", TextBox2.Text), new XElement("Age", TextBox3.Text)));
document.Save(Server.MapPath("Employee.xml"));
Label5.Text = "Data Created Successfully";
Label5.ForeColor = System.Drawing.Color.Green; TextBox4.Text = string.Empty;
TextBox1.Text = string.Empty;
TextBox2.Text = string.Empty;
TextBox3.Text = string.Empty;
TextBox5.Text = string.Empty;
}
}
}
}

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

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

Step 7: The attribute added to 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>
<Employee>
<Id Code="301">3</Id>
<FirstName>Raj</FirstName>
<LastName>Kumar</LastName>
<Age>22</Age>
</Employee>
</Employees>

I hope this article is useful for you.

Add Attribute to XML Using LINQ to XML

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