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Update Data to XML Using LINQ to XML

Posted by Vijay Prativadi Articles | XML October 15, 2012
Today, in this article let’s play around with one of the interesting and most useful concepts in LINQ to XML.
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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 update data to XML using LINQ to XML?

In simple terms "It provides flexibility to update data in XML with the help of a LINQ query."

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

 

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="WebForm1.aspx.cs" Inherits="LINQtoXMLUpdateApp.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="Update Data 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>

                </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="Update 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 LINQtoXMLUpdateApp

{

    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))

            {

                Label5.Text = "Please Enter Some Values";

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

            }

            else

            {

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

                var updateQuery = from r in document.Descendants("Employee")where r.Element("Id").Value == TextBox4.Textselect r;

                foreach (var query in updateQuery)

                {

                    query.Element("FirstName").SetValue(TextBox1.Text);

                    query.Element("LastName").SetValue(TextBox2.Text);

                    query.Element("Age").SetValue(TextBox3.Text);

                }

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

                Label5.Text = "Data Updated Successfully";

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

                TextBox4.Text = string.Empty;

                TextBox1.Text = string.Empty;

                TextBox2.Text = string.Empty;

                TextBox3.Text = string.Empty;

            }

        }

    }

}
 

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

update-data-using-linq-to-xml.png

 

Step 6: The data updating to XML output of the application looks like this:
 

data-using-linq-to-xml.png

 

Step 7: The data updated 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>Swetha</FirstName>

    <LastName>Prativadi</LastName>

    <Age>23</Age>

  </Employee>

</Employees>


I hope this article is useful for you.

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