Introduction:

In this code you have to write the file name with the extension .xml and the code will create the xml file with that name and populate it.

Code:

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Xml.Serialization;
using System.Xml;
using System.IO;

public partial class ExportToXml : System.Web.UI.Page
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ExportImportCS"].ConnectionString);
protected void Page_Load(object sender, EventArgs e)
}

public void ConnectionXML()
{
SqlCommand command = new SqlCommand();
command.CommandText = "SELECT * FROM BookIssueDetails";
command.CommandType = CommandType.Text;
command.Connection = con;
SqlDataAdapter da = new SqlDataAdapter(command);
DataSet ds = new DataSet();
da.Fill(ds, "BookIssueDetails");
if (ds.Tables[0].Rows.Count > 0)
{
grdXML.DataSource = ds;
grdXML.DataBind();
}

// Get a FileStream object
StreamWriter xmlDoc = new StreamWriter(Server.MapPath("~/FileTest/Testdo.xml"), false);
// Apply the WriteXml method to write an XML document
ds.WriteXml(xmlDoc);
xmlDoc.Close();
}

protected void btnExportToXml_Click(object sender, EventArgs e)
{
ConnectionXML();
}

Source code Page View

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ExportToXml.aspx.cs" Inherits="ExportToXml" %>
<!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 runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="grdXML" runat="server">
</asp:GridView>
</div>
<asp:Button ID="btnExportToXml" runat="server" OnClick="btnExportToXml_Click" Text="EXPORT XML" />
</form>
</body>
</html>