Hii tareq16278,

Please refer below sample.

XML

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

<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xhtml="http://www.w3.org/1999/xhtml" schemaLocation="http://www.w3.org/1999/xhtml">
  
  <url>
    <loc>/train/1/good-jjob</loc>
    <lastmod>2022-11-18</lastmod>
  </url>
  <url>
    <loc>/train/2/-asp-net</loc>
    <lastmod>2022-11-18</lastmod>
  </url>
  <url>
    <loc>/train/3/asp-null</loc>
    <lastmod>2022-11-18</lastmod>
  </url>
  <url>
    <loc>/train/4/aspbig</loc>
    <lastmod>2022-11-18</lastmod>
  </url>
  <url>
    <loc>/train/5/lovly</loc>
    <lastmod>2022-11-18</lastmod>
  </url>
  <url>
    <loc>/train/asp/ok</loc>
    <lastmod>2022-11-18</lastmod>
  </url>
  <url>
    <loc>/train/7/করতা-একপ্রেস</loc>
    <lastmod>2022-11-18</lastmod>
  </url>
  <url>
    <loc>/train/8/জোনাকি-asp</loc>
    <lastmod>2022-11-18</lastmod>
  </url>
  <url>
    <loc>/train/9/youto-big</loc>
    <lastmod>2022-11-18</lastmod>
  </url>
 
</urlset>

HTML

<asp:TextBox ID="txtSearch" runat="server"></asp:TextBox>
<asp:Button ID="btnSearch" Text="Search" runat="server" OnClick="OnSearch" />
<hr />
<asp:GridView ID="gvCustomers" runat="server" AutoGenerateColumns="false">
    <Columns>
        <asp:BoundField DataField="loc" HeaderText="Location" />
        <asp:BoundField DataField="lastmod" HeaderText="Last Modified" />
    </Columns>
</asp:GridView>

Nampespaces

C#

using System.Data;

VB.Net

Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        this.BindGrid();
    }
}

private void BindGrid(string prefix = "")
{
    using (DataSet ds = new DataSet())
    {
        ds.ReadXml(Server.MapPath("~/XMLFile.xml"));
        DataTable dt = ds.Tables["url"];
        if (!string.IsNullOrEmpty(prefix))
        {
            DataView dataView = dt.DefaultView;
            dataView.RowFilter = "loc LIKE '%" + prefix + "%'";
            dt = dataView.ToTable();
        }
        gvCustomers.DataSource = dt;
        gvCustomers.DataBind();
    }
}

protected void OnSearch(object sender, EventArgs e)
{
    this.BindGrid(txtSearch.Text);
}

VB.Net

Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
        If Not Me.IsPostBack Then
            Me.BindGrid()
        End If
    End Sub

    Private Sub BindGrid(ByVal Optional prefix As String = "")
        Using ds As DataSet = New DataSet()
            ds.ReadXml(Server.MapPath("~/XMLFile.xml"))
            Dim dt As DataTable = ds.Tables("url")
            If Not String.IsNullOrEmpty(prefix) Then
                Dim dataView As DataView = dt.DefaultView
                dataView.RowFilter = "loc LIKE '%" & prefix & "%'"
                dt = dataView.ToTable()
            End If
            gvCustomers.DataSource = dt
            gvCustomers.DataBind()
        End Using
    End Sub
    Protected Sub OnSearch(ByVal sender As Object, ByVal e As EventArgs)
        Me.BindGrid(txtSearch.Text)
    End Sub

Screenshot